Basic I/O programming

#include <stdio.h>
#include <stdlib.h>
int main()
{
   int num;
   FILE *fptr;
   // use appropriate location if you are using MacOS or Linux
   fptr = fopen("C:\\program.txt","w");
   if(fptr == NULL)
   {
      printf("Error!");   
      exit(1);             
   }
   printf("Enter num: ");
   scanf("%d",&num);
   fprintf(fptr,"%d",num);
   fclose(fptr);
   return 0;
}

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