Sprintf In C

























































sscanf() function is used to extract strings from the given string. Synta x : sprintf (char *buf, const char *format,. Definition for printf and putchar In C Programming,printf function to output a formatted string. Other C functions that are similar to the scanf function: fscanf function sscanf function See Also. Zugegeben, die Benutzung von getchar hat hier wenig Sinn, außer man hat vor, nur das erste Zeichen einer Eingabe einzulesen. C programmers are familiar with the functions sprintf and sscanf, which are used to respectively create and analyze strings according to format specifiers. However, C is a type-sensitive language thus PRINTF and printf would need to be defined as separate functions. These are two functions that print the binary representation of an integer. and the author uses sprintf. c For the C-language interfaces, the argument is an integer which is interpreted as a character. A humble request Our website is made possible by displaying online advertisements to our visitors. Sprint() function writes the formatted text to a character array. You should use sprintf to convert an int into a string, which I'll show you in a moment. Primarily designed for usage in embedded systems, where printf is not available due to memory issues or in avoidance of linking against libc. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. If you want to switch to normal printf delete the tiny_printf. It is defined in header file. By using special loop keywords,you can loop (jumping for those assembly junkies) through your code. Solving that kind of tricky C questions is. Both 'printf' and 'scanf' return integer after their execution. In the above code, we can parse the arguments, and then choose to either call va_overload2() or va_overload3(). (The sprintf is much more robust than is touched on here, but this will provide sufficient info for a basic start. Nov 25, 2013 · %c means "character" in ASCII. It's the crappiest language in the world. The sprintf() function formats and stores a series of characters and values in the array buffer. This is the handbook for Mbed OS 2. I've unfortunately been writing some C++. The returned string should be freed with g_free() when no longer needed. The fprintf() function is used to write set of characters into file. In my custom load testing class, we usually get into specific code examples that demonstrate how to do some tips and tricks in VUGen. sprintf in C and C++. It's not likely to be a *compiler* extension, though; printf is part of the runtime library. In C, when we initialize less no of elements in an array all uninitialized elements become ‘\0′ in case of char and 0 in case of integers. h" which is a header file in C language. Retargeting printf/scanf. In Python you can have a print statement print out a number of the same char by using print("X" * 5) which will give you XXXXX. sprintf / snprintf Problem on Arduino. h header file. Asked in Alternators What is difference between magneto and AC generator ?. It is possible to compare the string characters with vowels using. Sep 14, 2018 · printf (" The file is store at c: \\ files \\ word_files "); Output. The statement printf(“You Entered: %d”, number); is simply uses printf function to display the value or number that user have entered. Oct 14, 2006 · you didn't include the correct standard header file that tells the compiler what the printf function is supposed to look like. The function printf() and its cousins are among of the most versatile and well-known functions for sending formatted strings as output to files and the screen. Displaying FLOAT variables in Arduino It seems that the Arduino software doesn't have much support for displaying float variables, certainly the sprintf() function doesn't work. c For the C-language interfaces, the argument is an integer which is interpreted as a character. scanf is C function for scanning keyboard input like the cin object in C++ printf is C function to print to the display on like the object cout in C++ Upvote (1). PRINTF(3) Linux Programmer's Manual PRINTF(3) NAME top printf, fprintf, dprintf, sprintf, snprintf, vprintf, vfprintf, vdprintf, vsprintf, vsnprintf - formatted output conversion. Descriptions of C library functions IAR C Library Functions Reference Guide Description Terminates the program abnormally and does not return to the caller. Format vs printf The composite formatting technique is available in all. It is important that you should understand How A For Loop Works in C Programming before going further with this C Program To Generate Patterns of Numbers. This is an important distinction; gcc, for example, uses whatever runtime. The most popular output function in C programming has to be printf(). C library/kernel differences Since version 2. In ANSI C, the head of a varargs function looks just like its prototype. Any argument-list is converted and put out according to the corresponding format specification in the format-string. Understanding how printf and scanf works internally is the key to writing advance code. This section is now obsolete: The CCS C compiler now supports sprintf(), a printf() function that formats the string as desired but stores the result into a string. Background. See also g_vasprintf(), which offers the same functionality, but additionally returns the length of the allocated string. printf Function in C. Programmers worked much closer to the machine and had to understand how memory worked to make their programs efficient. When you want to solve multiple option type problems, for example: Menu like program, where one value is associated with each option and you need to choose only one at a time, then, switch statement is used. If I want to print 02 instead of 2 with printf in c, how do I do that? 3 comments. What is printf and scanf function in C C Programming language tutorial, Sample C programs, C++ Programs, Java Program, Interview Questions, C graphics programming, Data Structures, Binary Tree, Linked List, Stack, Queue, Header files, Design Patterns in Java, Triangle and Star pyramid pattern, Palindrome. 9000-166-g656dd306d4 Powered by Code Browser 2. sprintf() function is a file handling function in C programming language which is used to write formatted output to the string. It’s everyone’s favorite. This function works "step-by-step". There are a number of explanations for the unexplained characters:. Mar 21, 2013 · C++ Program to define a Class BOOK and accessing member function using its object. These are the top rated real world C++ (Cpp) examples of SString::sprintf extracted from open source projects. 'printf' and 'scanf' are two most basic functions of C but do you know they also return values. The argument is interpreted as a long int or unsigned long int for integer specifiers (i, d, o, u, x and X), and as a wide character or wide character string for specifiers c and s. Lets see how to use these keywords. Must Read: C Program To Replace A String Character. Same as Printf. The complete conversion specification is '%%'. I'm trying every format I can, but just can't seem to work out why I can't get the double values to format properly. C provides standard functions scanf() and printf(), for performing formatted input and output. Printf in c. This code creates a csv file and stores info of 2D array which contains marks of 3 subjects (Physics , chemistry , maths ) along with student id. How to display text with printf(). However there is a useful c function called dtostrf() which will convert a float to a char array so it can then be printed easily. Aside from being one of the most popular text-output functions in the C language, printf() is the most powerful. Aug 30, 2019 · But today we’re going to talk about printf-style format strings. Format specifiers are used in many C functions and in RTL for classes like UnicodeString. The fprintf() function is same as printf() but instead of writing data to the console, it writes formatted data into the file. This is different from the C version in two ways: 1) only one "%" operator is allowed for the string, and 2) only floating point numbers (float and double) are allowed. (additional arguments) Depending on the format string, the function may expect a sequence of additional arguments, each containing a value to be used to replace a format specifier in the format string (or a pointer to a. View Plans. Actually, the LCD driver wasn't written by me. Pike had its own sprintf and sscanf, which are not entirely unlike those in C. Synta x : sprintf (char *buf, const char *format,. Jul 12, 2012 · The C-style technique of using printf and the associated family of functions such as printfn, sprintf and so on. Take a look at it, and then compile and run it. "printf" is the name of one of the main C output functions, and stands for "print formatted". Exercise 1. What printf returns 'printf' returns the number of characters printed on the. Please find below the description and syntax for each above file handling functions. This program demonstrates basic use of "C" library function printf. format is a format string composed of conversion specifications that convert and add the next argument to the output. % A '%' is written. Write your own printf() function in c. str − This is the pointer to an array of char elements where the resulting C string is stored. Actually, printf is a reason why C has them - printf formats are too complex to be usable without them. c For the C-language interfaces, the argument is an integer which is interpreted as a character. The Main Method. snprintf vs sprintf. sine_and_cosine_2. #include the latter is for C++, the former for C. View Plans. In both cases these provide simple functionality and fixed format compared to more sophisticated and flexible template engines or parsers, but are. printf returns 0 if it was executed successfully and -1 otherwise. C uses the printf function for printing to standard out (the terminal), and scanf is one function for reading in values (usually from the keyboard). The linker takes these references into account and. I just wasted 90 perfectly good minutes attempting to put thousands separators in numbers that I'm printf ing. Here i will show you how to print all number Pattern in c language with explanation. It's type-safe, and more OO than sprintf, but not as easy to read and not as easy to localize. Sprint() function writes the formatted text to a character array. If extrinsic calls are not possible, the code generator produces C code for sprintf. h abs int abs(int j) Parameters Return value An int having the absolute. This blog provides source code in C Language for BCA, BTECH, MCA students. In particular, single- and double-quoted strings are treated differently in shell scripts than in C programs. Printf And Scanf Example Program In C Programming Definition of Printf And Scanf : scanf is a function that reads formatted data from stdin. hier Gruß Tommy "Wer den schnellen Erfolg sucht, sollte nicht programmieren, sondern Holz hacken. To make use of time and date function you need to include the time. See the CCS manual for documentation of sprintf(). ly/2qcpql3 Abonnieren & nichts mehr verpassen: http://bit. Writes into the array pointed by str a C string consisting on a sequence of data formatted as the format argument specifies. Format function, which takes a format string and some arguments, and generates an output string. 'zz' is an array of 8 pointers to character but none of them are given the address of valid memory. C Tutorial; printf scanf; printf Escape Sequence; #include main() { printf. The printf() function formats and writes output to the standard output stream stdout. These work on console stdin and stdout files respectively hence, these two works works on files and are file operators. Learn C programming, Data Structures tutorials, exercises, examples, programs, hacks, tips and tricks online. These include following categories: 1. I highly recommend this book to anyone who is interested in learning more about C, it is a must have for any embedded programmer. Jun 16, 2016 · List of Pattern Program in C Programming Language. h header file from the standard C library. The C library function sprintf is used to store formatted data as a string. Using the output function printf When you are performing calculations, you usually want to report your results ("the answer") to the screen. Concepts - Write a C program to reverse the string without using strrev() function?. These are two functions that print the binary representation of an integer. 'zz' is an array of 8 pointers to character but none of them are given the address of valid memory. Test your knowledge on 'C' Programming Language. Detection of encoding errors in swprintf may differ from that in sprintf. A humble request Our website is made possible by displaying online advertisements to our visitors. ly/2qcpql3 Abonnieren & nichts mehr verpassen: http://bit. printf and scanf - printf() and scanf() both are predefined function in stdio. Escape sequences are used in the programming languages C and C++, and their design was copied in many other languages such as Java and C#. It's hard to explain so. Jul 12, 2012 · The C-style technique of using printf and the associated family of functions such as printfn, sprintf and so on. Printf scanf in c language with programming examples for beginners and professionals covering concepts, difference between scanf and printf, control statements, c array, c pointers, c structures, c union, c strings and more. format − This is the String that contains the text to be written to buffer. The fprintf function allows you to "write" information to the screen for the user to view. edu C-C++-R www. The identifier is the character that ends Here is a list of the format identifers as used in 'printf' ,'sprintf' ,'fprintf' and 'scanf'. By tommy69 in forum C Programming. The syntax of the sprintf function is as follows: int sprintf (char *string, const char *form, …. In most of the MNC interview questions such as in ZOHO interview question, IVTL Infoview interview questions, Amazon interview questions, GOOGLE interview questions, Infosys interview questions and even in Voonik interview questions, We come across several Tricky C Questions about which 2:5 of the questions are from Printf in c. To substitute in a string or string variable, use %s:. The above example could be coded in C as follows. The linker takes these references into account and. In ANSI C, the head of a varargs function looks just like its prototype. The other main difference between sprintf_s and sprintf is that sprintf_s takes a length parameter specifying the size of the output buffer in characters. It can format all sorts of variables in unique ways, with padding and alignment options that even veteran C programmers can't recite from memory. You should use sprintf to convert an int into a string, which I'll show you in a moment. This article is for programmers who port C/C++ code to C#. The string format may contain format specifiers starting with % which are replaced by the values of variables that are passed to the printf() function as additional arguments. We will discuss two Dimensional array. I created this function a while back to save on having to combine mysql_real_escape_string onto all the params passed into a sprintf. swprintf and fwprintf behave identically except that swprintf writes output to a string rather than to a destination of type FILE , and swprintf requires the. while loop. By default, the sprintf function supports only a minimum set of features and converting floats is, of course, not included. sprintf is a wrapper for the system sprintf C-library function. If you have a "string" of characters, you use. The string format may contain format specifiers starting with % which are replaced by the values of variables that are passed to the sprintf() function as additional arguments. printf format strings are complementary to scanf format strings, which provide formatted input. In both cases these provide simple functionality and fixed format compared to more sophisticated and flexible template engines or parsers, but are. It is a useful way of keeping the code size of GCC built programs (XC32 is GCC by another name) down as bringing in a lot of GCC libraries can really bloat code and massively increase your stack usage. An entire C-style string can be easily printed, by using the %s formatting symbol, along with the name of the char array storing the string (as the argument filling in that position):. Please refer to your shell's documentation for details about the options it supports. Displaying FLOAT variables in Arduino It seems that the Arduino software doesn't have much support for displaying float variables, certainly the sprintf() function doesn't work. Until the compiler has seen that, it doesn't know what to make of printf. It has since spread to many other operating systems, and is one of the most widely used programming languages. C provide us some in build function like printf (), scanf etc. I'll cover itoa in case you've ever wondered what it does. \v: Vertical Tab : printf Escape Sequence « printf scanf « C Tutorial. h header file. This post is all about knowing the return values of 'scanf' and 'printf' of C. format − This is the String that contains the text to be written to buffer. The sprintf() function writes a formatted string to a variable. 0 compiler will change the call to printf into a call to __2printf but also emit references to symbols like _printf_c and _printf_x depending on the format string/argument types. Background. Almost all the arguments of fprintf() function is same as printf() function except it has an additional argument which is a file pointer to the file where the formatted output will be written. This only happens if you use number arguments first, then switch to a non-numbered, and then back to a numbered one. I love you program in c. The sprintf function returns the number of characters actually written to buffer. C came along as a better assembly allowing programmers to manipulate memory directly with pointers. Is that standard C or a compiler extension? It's an extension. C uses the printf function for printing to standard out (the terminal), and scanf is one function for reading in values (usually from the keyboard). Printf working principle. I've unfortunately been writing some C++. The snprintf() function with the addition of the n argument, which indicates the maximum number of characters (including at the end of null character) to be written to buffer. Aug 30, 2019 · But today we’re going to talk about printf-style format strings. This post is all about knowing the return values of 'scanf' and 'printf' of C. Look if you have a c-file called tiny_printf. The following example shows how to printf to a string for users who do not have sprintf() or would still like to see the old method. Whatwillprintoutisdifferentforeverycomputer anddifferent!everytime!that!this!functionis!used. Because the printf function in the file overrides the printf function of newlib. The arg1, arg2, ++ parameters will be inserted at percent (%) signs in the main string. This is an important distinction; gcc, for example, uses whatever runtime. The string format may contain format specifiers starting with % which are replaced by the values of variables that are passed to the printf() function as additional arguments. Then the elements of this array should randomly be initialized either to 1 or 0. We will first see some of the format specifiers and special characters and then start the examples of formatted printing. result+nresult,"%s",name); nresult is an integer da. After all, the names of the functions only differ by the character 'n'! This is actually a pretty common convention in C: the function with the 'n' will require an upper bound or maximum size as an argument. printf(), scanf() and comments in C with example Hello everyone, I hope you must have done the practical test of our previous programs. A humble request Our website is made possible by displaying online advertisements to our visitors. I created this function a while back to save on having to combine mysql_real_escape_string onto all the params passed into a sprintf. printf/scanf with C-strings. If you naively read the man pages, it looks easy — just include ' in your format specifier. HOME C C++ DS Java AWT Collection Jdbc JSP Servlet SQL PL/SQL C-Code C++-Code Java-Code Project Word Excel. printf("%d + %d = %d\n", a, b, c); In the printf statement, it is extremely important that the number of operators in the format string corresponds exactly with the number and type of the variables following it. By default, the sprintf function supports only a minimum set of features and converting floats is, of course, not included. Just include. c -lm We compile pi. The built-in printf (print formatted) command prints a message to the screen. Next, we are using For Loop to iterate the array values and print all the elements in this array. µVision ® IDE. h” which is a header file in C language. A great thing about the printf formatting syntax is that the format specifiers you can use are very similar — if not identical — between different languages, including C, C++, Java, Perl, PHP, Ruby, Scala, and others. For printf with floating points i have "Newlib standard" in use. The rough equivalent of sprintf in. I read in other threads that I should not check "using tiny_printf. This example program demonstrates how to print hexadecimal versions of numbers in C using printf. After the format parameter, the function expects at least as many additional arguments as specified in for. Perl does its own sprintf formatting: it emulates the C function sprintf(3), but doesn't use it except for floating-point numbers, and even then only standard modifiers are allowed. If format includes format specifiers (subsequences beginning with %), the additional arguments following format are formatted and inserted in the resulting string replacing their respective specifiers. Here is my quick reference for the "conversion specifications format" aka the "format specification fields". Here are some examples of common string formatting tasks. An escape sequence is a sequence of characters that does not represent itself when used inside a character or string literal, but is translated into another character or a sequence of characters that may be difficult or impossible to represent directly. Jun 16, 2016 · List of Pattern Program in C Programming Language. This is a tiny but fully loaded printf, sprintf and (v)snprintf implementation. The following example opens a log file and writes the id number and group name of the Virtual User to it using fprintf. These functions are declared and related macros are defined in “stdio. In C++11 and later modes, all three are treated as constant expressions and can be used in constexpr constexts. In today’s C programming language tutorial we take a look at how to use time and date from C programs. This Test covers on these topics: Constants,Variables,Data types,Operators,Expression,Data input and outp JavaScript is disabled on your browser. Perl does its own sprintf formatting: it emulates the C function sprintf(3), but doesn't use it except for floating-point numbers, and even then only standard modifiers are allowed. There are a number of explanations for the unexplained characters:. h" which is a header file in C language. C is one of the most widely used programming languages of all time. Jun 16, 2016 · List of Pattern Program in C Programming Language. size specifies the maximum length of the string at least. Mar 13, 2012 · (The sprintf is much more robust than is touched on here, but this will provide sufficient info for a basic start. In the C/C++ sources of this project, there were many [sf]printf statements. Switch statement is a control statement that allows us to choose only one choice among the many given choices. Similarly octal and hex numbers has base 8 and 16 respectively. C Language: scanf function (Formatted Read) In the C Programming Language, the scanf function reads a formatted string from the stdin stream. printf returns 0 if it was executed successfully and -1 otherwise. Switch statement is a control statement that allows us to choose only one choice among the many given choices. See also g_vasprintf(), which offers the same functionality, but additionally returns the length of the allocated string. C printf Interview Questions. Subject: [cpp-l] sprintf equivalent in C++ Hi My requirement is to convert the following to C++ char buffer[90]; sprintf will work in C++, just fine. This function uses the format string to call the system "sprintf" function. Go by Example: String Formatting Go offers excellent support for string formatting in the printf tradition. The C library function sprintf is used to store formatted data as a string. Whatwillprintoutisdifferentforeverycomputer anddifferent!everytime!that!this!functionis!used. Is there any chance that the system module could be rewritten to not use C for converting floats and pointers? While it's understandable to drop down for low level system calls, sprintf doesn't need to access anything other than the provided buffer and arguments. It provide C programs like Looping, Recursion, Arrays, Strings, Functions, File Handling and some advance data structures. Also check for faulty strncat usage (example below). Dec 05, 2015 · DIFFERENT FORMATTING WITH PRINTF STATEMENT IN C? — December 5, 2015. Summary: This page is a printf formatting cheat sheet. printf/scanf with C-strings. In this case, the code generation restrictions for sprintf do not apply and the behavior of sprintf in the generated code is the same as the behavior in MATLAB. We can also get the total number of printed character using printf(), printf() returns the total number of printed character, that we can store in a variable and print. Slightly off-topic, but I do not agree at all with your comment regarding snprintf: it is difficult to use sprintf in a secure manner (and practically impossible if you use a %s format specifier), but snprintf, when used correctly, is safe: when snprintf truncates the input, because its size exceeds the buffer, it is not silent but tells you by giving a return value equal to the buffer size. How to sprintf a float with Arduino Arduino has a small limitation in sprintf function that does not print correctly float numbers. We can also get the total number of printed character using printf(), printf() returns the total number of printed character, that we can store in a variable and print. Now here is an output from the program: Output of Scanf in C Programming Comments in C. For the latest information about Serial, please see The Windows serial driver. 50 Function Names as Strings. C program. How can I stuff the variable with what printf returns?. "printf" is the name of one of the main C output functions, and stands for "print formatted". c:35: warning: format ‘%lf’ expects type ‘double’, but argument 4 has type ‘double *’ The thing is if I try and compile this on the my universitys linux server it compiles fine as have all the times I've tried to print an array element, it's only on my laptop which runs Ubuntu 9. This Test covers on these topics: Constants,Variables,Data types,Operators,Expression,Data input and outp JavaScript is disabled on your browser. h header file. C is one of the most widely used programming languages of all time. I accidentally typed %b instead of %d in a printf format string and got a binary representation of the number. The syntax of the sprintf function is as follows: int sprintf (char *string, const char *form, …. format can contain backslash-escape sequences. and all C format specifications ending with one of diouxXfeEgGcs, with ARGUMENTs converted to proper type first. All I/O in C is done using standard library functions. The fprintf function allows you to "write" information to the screen for the user to view. format is a format string composed of conversion specifications that convert and add the next argument to the output. This small printf function is a tiny implementation of the standard C library function, it does not include all the capabilities of the standard one. The returned string should be freed with g_free() when no longer needed. "printf" is the name of one of the main C output functions, and stands for "print formatted". The community has made it clear that printf and its cousins are still heavily used and would benefit from more rigorous diagnostics when used. Header file stdlib. what are the other differences. The fprintf() function is same as printf() but instead of writing data to the console, it writes formatted data into the file. Break long Printf Statement Upto Multiple Lines in C : Printf statement is used for displaying text,message or output of the program. result is a string name is a char array tell me what is this statement doing and how to do this in c#. outbuf is assumed already to point to allocated memory sufficient to hold the generated characters--see man sprintf for more information. printf(), scanf() and comments in C with example Hello everyone, I hope you must have done the practical test of our previous programs. Escape sequences are used in the programming languages C and C++, and their design was copied in many other languages such as Java and C#. Printf and scanf are the functions used most frequently in C language for input and output. The --printf_support option is a compiler option but it needs to be passed to the linker as well. Note that sprintf() does the opposite of a function like atoi() -- where atoi() converts a string into a number, sprintf() can be used to convert a number into a string. The snprintf() function is identical to the sprintf() function with the addition of the n argument, which indicates the maximum number of characters (including the ending null character) to be written to buffer. C provide us some in build function like printf (), scanf etc. Key concepts involved are variable number of arguments in functions using vararg in C. All I/O in C is done using standard library functions. and the author uses sprintf. By tommy69 in forum C Programming. str − This is the pointer to an array of char elements where the resulting C string is stored. The functions in the printf() family produce output according to a format as described below. Input & Output Functions in 'C' Input means to provide the program with some data to be used in the program; Output means to display data on screen or write the data to a printer or a file. 10 hours ago · We use cookies for various purposes including analytics. Slightly off-topic, but I do not agree at all with your comment regarding snprintf: it is difficult to use sprintf in a secure manner (and practically impossible if you use a %s format specifier), but snprintf, when used correctly, is safe: when snprintf truncates the input, because its size exceeds the buffer, it is not silent but tells you by giving a return value equal to the buffer size. The topics covered are; a little printf background, format specifiers and conversions, formatting of different types and format conversions of strings. String Formatting in C and C++. printf(), scanf() and comments in C with example Hello everyone, I hope you must have done the practical test of our previous programs. This blog provides source code in C Language for BCA, BTECH, MCA students. result is a string name is a char array tell me what is this statement doing and how to do this in c#. We can also get the total number of printed character using printf(), printf() returns the total number of printed character, that we can store in a variable and print. It's hard to explain so. By default, the sprintf function supports only a minimum set of features and converting floats is, of course, not included. printf() prototype int printf( const char* format, ); The printf() function writes the string pointed to by format to stdout. It sends formatted output to a stream. Whats the difference between the printf and cout statements? Printf is used in c,cout is used in c++ and they used for displaying a output. C printf Interview Questions. Choose the Parameters tab from the pop-up window and type the following into the Linker area: -lbgi -lgdi32 -lcomdlg32 -luuid -loleaut32 -lole32 You can now compile and run programs that use the WinBGIm graphics library, such as this one that opens a small window, draws a circle and waits for the user. Declaration: void outtextxy(int x, int y, char *string); x, y are coordinates of the point and third argument contains the address of string to be displayed. Nov 09, 2011 · Here it is cfprintf (for color fprintf). The POSIX open() function may have a similar implementation on your system. Understanding how printf and scanf works internally is the key to writing advance code. It is important that you should understand How A For Loop Works in C Programming before going further with this C Program To Generate Patterns of Numbers. The statement printf(“You Entered: %d”, number); is simply uses printf function to display the value or number that user have entered. For example, the RVCT 4. Since I was unable to find any function that checks for the output stream that printf() uses, I just had to drop the crazy use of the printf(). explain printf and scanf in 'c' C read a character char. Concepts - Write a C program to reverse the string without using strrev() function?. c(34): Total number of bytes read = 69977 16.