> #include <stdio.h>
> int main()
> {
>     int N;
>     while(1)
>     {
>         scanf("%d",&N);
>         if(N<0||N>10000)
>         break;
>         printf("%5d",N);
>         printf(" -> ");
>         printf("%d\n",compute(N));
>     }
> }
> 
while(scanf("%d",&N)!=EOF){...}
> #include <stdio.h>
> int main()
> {
>     int N;
>     while(scanf("%d",&N))
>     {
>         break;
>         printf("%5d",N);
>         printf(" -> ");
>         printf("%d\n",compute(N));
>     }
> }