File of Integers

#include <stdio.h>
#include <conio.h>

void main(void)
{
    FILE *fp;
    int i,n,num;

    clrscr();
    printf("Program on Creation of a File of Integers\n");
    printf("\nEnter how many integers you want to store : ");
    scanf("%d",&n);
    fp = fopen("three.dat","w");
    if (fp == NULL)
      {
        printf("File Opening Error\n");
        exit(0);
      }
    printf("\nEnter %d integers : ",n);
    for (i=1;i<=n;i++)
       {
        scanf("%d",&num);
        putw(num,fp);
       }
    printf("\n The file \"three.dat\" is created");
    fclose(fp);
    printf("\nPress any key to end...");
    getch();
}