c语言杨辉三角程序怎么实现

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#include 

int main() {
    int rows, coef = 1, space, i, j;

    printf("?????:");
    scanf("%d", &rows);

    for (i = 0; i < rows; i++) {
        for (space = 1; space <= rows - i; space++)
            printf("  ");

        for (j = 0; j <= i; j++) {
            if (j == 0 || i == 0)
                coef = 1;
            else
                coef = coef * (i - j + 1) / j;

            printf("M", coef);
        }

        printf("\n");
    }

    return 0;
}

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