C语言二维数组实例简单的杨辉三角形

#include <stdio.h>
#define n 9
int main() {
    int a[n][n];
    putchar('\n');
    for (int i = 0; i < n; i++) {
        a[i][0] = 1;
        a[i][i] = 1;
    }
    for (int i = 2; i < n; i++)
        for (int j = 1; j < i; j++)
            a[i][j] = a[i - 1][j - 1] + a[i - 1][j];
    for (int i = 0; i < n; i++) {
        for (int j = 0; j <= i; j++)
            printf("%-5d", a[i][j]);
        putchar('\n');
    }
    return 0;
}

1
1    1
1    2    1
1    3    3    1
1    4    6    4    1
1    5    10   10   5    1
1    6    15   20   15   6    1
1    7    21   35   35   21   7    1
1    8    28   56   70   56   28   8    1