C program to read text from file

#include<stdio.h>

void main()

{

   char str[70];

   FILE *p;

   clrscr();

   if((p=fopen("string.txt","r"))==NULL)

   {

      printf("\nUnable t open file string.txt");

      exit(1);

   }

   while(fgets(str,70,p)!=NULL)

            puts(str);

   fclose(p);

}