Error Handling in C

In C we can handle errors using special variable called errno which is defined in <errno.h> header file. Whenever any error occurs during execution of the c program, the error number is stored in errno variable. To print the error description, we use below function call.

strerror( errno);

We can clear error number using below line.

Errno = 0;

#include <stdio.h>

#include <errno.h>

#include <string.h>

extern int errno ;

int main ()

{

   FILE * pf;

   pf = fopen ("abdc.txt", "r");

   if (pf == NULL)

   {

      printf("errno contains value : %d\n", errno);

      printf("Human readable error description : %s\n", strerror( errno ));

   }

   else

   {

      fclose (pf);

   }

   return 0;

}

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