strerror function returns error message

Syntax

C strerror function has the following format.

Header

C strerror function is from header file string.h.

Description

C strerror function returns error message associated with the errnum.

Example

Print an implementation-defined error message on the screen:

#include<string.h>
#include<stdio.h>
int main(void){
  printf(strerror(10));/*from w  w w  .j  a  va2  s  .  c om*/
}

The following code uses strerror in case of file open error.

#include <stdio.h>
#include <string.h>
#include <errno.h>
/*from   w w w  .jav  a 2 s. c  o m*/
int main ()
{
  FILE * pFile;
  pFile = fopen ("unexist.ent","r");
  if (pFile == NULL)
    printf ("Error opening file unexist.ent: %s\n",strerror(errno));
  return 0;
}

The code above generates the following result.