C Exercise Example 38
100 cases of classic C language
Topic: seeking a 3 * 3 matrix and diagonal elements of the
Program analysis: the use of a double for loop control input two-dimensional array, then a [i] [i] after cumulative output.
Source Code:
// Created by www.w3big.com on 15/11/9.
// Copyright © 2015年 本教程. All rights reserved.
//
#include<stdio.h>
#define N 3
int main()
{
int i,j,a[N][N],sum=0;
printf("请输入矩阵(3*3)：\n");
for(i=0;i<N;i++)
for(j=0;j<N;j++)
scanf("%d",&a[i][j]);
for(i=0;i<N;i++)
sum+=a[i][i];
printf("对角线之和为：%d\n",sum);
return 0;
}
The above example output is:
请输入矩阵(3*3)： 1 2 3 4 5 6 7 8 9 对角线之和为：15