#include <stdio.h>

int main( void )
{
    int quit = 0, num = 1, square;

    while ( quit == 0 )       /* or while ( ! quit ) */
    {
        printf( "Please enter a number\n" );
        scanf( "%d", &num );
        square = num * num;
        printf( "Square of %d=%d\n", num, square );
        while ( getchar() != '\n')
            ;
        printf( "Another square? (y/n) " );
        if ( getchar() == 'n' )
            quit = 1;
    }
}