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   perror

   Usage
   #include <stdlib.h>
   void perror(char *msg);

   Description
   Displays  a message on the standard output describing the  last  error
   that occurred in a system call or library function call. The  argument
   msgis printed first, then a colon, followed by the error description.

   Example
   #include <stdio.h>
   #include <stdlib.h>
   main()
   {
   FILE *fp;
   char *string = "Error message";

        if((fp = fopen("fild.dat","r")) == NULL)
             perror(string);
        else
             printf("File open for reading\n");

        fclose(fp);
   }