#include<stdio.h>#define M 3#define N 3 int main() { int sum=0; double average=0.0; int a[M][N];//定义二维数组 for (int i=0; i < M; i++) {//初始化二维数组 for (int j=0; j < N; j++) { a[i][j] = i * 2 + j * 3; } } //使用双重循环,求二维数组的和 for (int i=0; i < M; i++) { for (int j=0; j < N; j++) { sum += a[i][j]; printf("%d ", a[i][j]); } printf("\n"); } average = ((double)sum)/(M*N);//计算平均数 printf("sum = %d, average=%lf\n",sum, average); return 0;}