96.求方阵对角线上元素之和

函数fun的功能是：输出M*M列整数方阵，然后求两条对角线上元素之和，返回此和数。

#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>#define M 5int fun(int n, int xx[][M]){int i, j, sun = 0;printf("\nThe %d x %d matrix:\n", M, M);for (i = 0;i < M;i++){for (j = 0;j < M;j++)printf("  %d  ", xx[i][j]);printf("\n");}for (i = 0;i < n;i++)sun += xx[i][i] + xx[i][n - i - 1];return sun;}int main(){int aa[M][M] = { {1,2,3,4,5},{4,3,2,1,0},{6,7,8,9,0},{9,8,7,6,5},{3,4,5,6,7} };printf("\nThe aun of all elements on 2 diafnals is %d.", fun(M, aa));system("pause");return 0;}