/* fichero cuadrado.c */
# include <stdio.h>
void main(void)
{
    int num=1;
    while (num<21) {
        printf("%10d %10d\n", num, num*num);
        num = num + 1;
    }
    getchar();
    num = 1;
    while(num<21) {
        printf("%10d %10d\n", num, num*num);
        num += 1;
    }
    getchar();
    num = 1;
    while(num<21) {
        printf("%10d %10d\n", num, num*num);
        num++;
    }
}