C fputs() function

C library function - fputs()

The fputs() function is used to copy string to the output stream at the current position. At the end of the string, the null character (/0) is not copied.


int fputs(const char *string, FILE *stream);


Name Description Required /Optional
str This is the variable in which the string will be stored. Required
stream Identifies an address for a file descriptor, which is an area of memory associated with an input or output stream. Required

Return value

  • Upon successful completion, fputs() shall return a non-negative number.
  • Otherwise, it shall return EOF, set an error indicator for the stream, and set errno to indicate the error.

Example: fputs() function

#include <stdio.h>
int main () {
   FILE *fp;
   char string[100];
   fp = fopen("test.txt", "w+");
   fputs("C programming.", fp);
   fputs("C Exercises.", fp);
   printf("The string is:\n%s",string);
   return 0;


The string is:
C programming.C Exercises.

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C Programming: Tips of the Day

What's an object file in C?

An object file is the real output from the compilation phase. It's mostly machine code, but has info that allows a linker to see what symbols are in it as well as symbols it requires in order to work. (For reference, "symbols" are basically names of global objects, functions, etc.)

A linker takes all these object files and combines them to form one executable (assuming that it can, i.e.: that there aren't any duplicate or undefined symbols). A lot of compilers will do this for you (read: they run the linker on their own) if you don't tell them to "just compile" using command-line options. (-c is a common "just compile; don't link" option.)

Ref : https://bit.ly/3CbzF8M