谭浩强c++第三版5-3

#include<iostream>
using namespace std;

//求一个3*3矩阵对角线元素之和

int main()
{
	int a[3][3],sum=0;
	cout << "请输入这个矩阵:" << endl;
	for (int i = 0; i < 3; i++)
		for (int j = 0 ; j < 3; j++)
			cin >> a[i][j];
	for (int i = 0; i < 3; i++)
		for (int j =0 ; j < 3; j++)
			if (i == j || i + j == 2)
				sum += a[i][j];
	cout << "对角线元素之和为:" << sum << endl;
	return 0;
}

标签：std,cout,int,sum,第三版,c++,++,谭浩强,main
来源： https://blog.csdn.net/weixin_44817229/article/details/104818096