雪地跪求高手指点下：定义一个3*3的二位数组编写程序求各行元素之和。

#include "stdio.h"
void main()
{int a[3][3]={1,2,3,4,5,6,7,8,9};
int i,j,sum[3]={0,0,0};
system("cls");
for(i=0;i<3;i++)
{for(j=0;j<3;j++)
{switch(i)
{case 0:sum[0]+=a[i][j];break;
case 1:sum[1]+=a[i][j];break;
case 2:sum[2]+=a[i][j];break;}
}
}printf("\n%d\n%d\n%d",sum[0],sum[1],sum[2]);}

#include <iostream>

using namespace std;

int main()
{
int ia[3][3] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
int max[3] = {0};
int i, j;

for (i = 0; i < 3; ++i)
{
for (j = 0; j < 3; ++j)
max[i] += ia[i][j];
}

cout << max[0] <<'\t' << max[1] << '\t' << max[2] << endl;

return 0;
}

#include<stdio.h>
void main()
{
int a[3][3],sum[3] = {0},i,j;
for(i=0;i<