125上机2

#include<iostream>
using namespace std;
int main()
{
	int i, j;
	int sum1 = 0, sum2 = 0, sum3 = 0;
	int a1d[3][3] =
	{
		{1,2,3},
		{4,5,6},
		{7,8,9}
	};
	int(*p2d)[3] = a1d;
	for (i = 1; i < 3; i++)
	{
		for (j = 0; j < i; j++)
			sum1 += *(p2d[i] + j);
	}cout << "下三角的和为" << sum1 << endl;
	for (int a = 0; a < 3; a++)
	{
		for (int b = 0; b < 3; b++)
			if (b == a || b < a)
			{
				continue;
			}
			else
			{
				sum2 += *(p2d[a] + b);
			}
	}cout << "上三角的和为" << sum2 << endl;
	for (int c = 0; c < 3; c++)
	{
		for (int d = 0; d < 3; d++)
		{
			if (d == c)
			{
				sum3 += *(p2d[c] + d);
			}
			else
				continue;
		}
	}cout << "主对角线的和为" << sum3;


	return 0;
}