Description

The C library function, The ferror () function tests if an error has occured in the file.

Declaration

Following is the declaration for ferror() function.

int ferror(FILE *stream)

Parameters

stream - The stream whose error indicator is to be tested.

Return Value

The ferror function returns 0 if no error has occurred and returns nonzero if an error has occurred.

Example

#include <stdio.h>
#include <stdlib.h>

int main()
{
   FILE *f;

   if((f=fopen("test", "rb"))==NULL)
	{
		 printf("Cannot open file.\n");
		 exit(1);
   }

   putc('C', f);
   if(ferror(f)) {
     printf("File Error\n");
     exit(1);
   }
  
   fclose(f);
   return 0;
}

Output

File Error