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perror() function of stdio.h in C

In this article, we are going to learn about the perror() function of stdio.h header file in C programming language, and use it prints a descriptive error message to stderr.
Submitted by Abhishek Sharma, on April 12, 2018

This function is very useful as it prints the error message on the screen. All we have to do is if you have a situation where we caught an error; call this function with a parameter of string.

The String which will be printed first, a colon, a space then the error message.

Example:

    perror("here is the error");
    will print →
    here is the error : ERROR MESSAGE.

stdio.h - perror() function Example in C



#include <stdio.h>

int main ()
 {

    // defining the file pointer
   FILE *f;

   // rename file name
   rename("abc.txt", "abcd.txt");

   // open file
   f = fopen("file.txt", "r");

   // condition if error then print error
   if( f == NULL ) {
      perror("Error in Code is: ");
      return(-1);
   }

   // close the file
   fclose(f);

   return(0);
}

Output

stdio.h - perror()  in c language






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