用C语言打印杨辉三角

//打印杨辉三角
// 可变为
//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

int main()
{
    int arr[10][10] = { 0 };
    int i = 0;
    int j = 0;
    for (i = 0; i < 10; i++)//不能等于10，因为下标从0开始，下标为10时，越界访问
    {
        for (j = 0; j <= i; j++)
        {
            if (j == 0)
            {
                arr[i][j] = 1;
            }
            if (i == j)
            {
                arr[i][j] = 1;
            }
            if (i >= 2 && j >= 1)
            {
                 arr[i][j] = arr[i - 1][j-1] + arr[i-1][j];
            }
        }
    }
    for (i = 0; i < 10; i++)
    {
        for (j = 0; j<= i; j++)
        {
            printf("%d ", arr[i][j]);
        }
        printf("\n");
    }
    return 0;
}