#include <stdio.h>

int main( void )
{
    int num, square;

    printf( "Enter a number: " );
    scanf( "%d", &num );

    while ( num != 0 )
    {
        square = num * num;
        printf( "Square of %d = %d\n", num, square );

        printf( "Enter a number (0 to quit) \n" );
        scanf( "%d", &num );
    }
}