程序代码：

#include<stdio.h>
int main()
{
    int i, j, a[9][9];
    for (i = 1; i <= 9; i++)
        for (j = 1; j <= i; j++)
        {
            if (i == j || j == 1)
                a[i][j] = 1;
            else
                a[i][j] = a[i - 1][j - 1] + a[i - 1][j];
        }
    for (i = 1; i <= 9; i++)
    {
        for (j = 1; j <= i; j++)
            printf("%-4d", a[i][j]);
            printf("\n");
    }
    return 0;
}