编程基本功——打印杨辉三角

#include "stdio.h"

int main()
{
    int i, j, k, buf[7], tmp[7];

    for (i=0; i<=6; ++i)
    {
        if (i == 0)
            printf("%d", 1);
        else  if(i == 1)
        {
            printf("\n%d %d\n",1,1);
            buf[0] = 1;
            buf[1] = 1;
        }
        else
        {
            for (j = 1; j <= i+1; ++j)
            {
                if (j == 1 || j == i+1)
                {
                    printf("%d ", 1);
                    tmp[j-1] = 1;
                }
                else
                {
                    printf("%d ", buf[j-2] + buf[j-1]);
                    tmp[j-1] = buf[j-2] + buf[j-1];
                }
            }
            printf("\n");
            for (k = 0; k < 7; ++k)
            {
                buf[k] = tmp[k];
            }
        }
    }
    return 0;
}