有一个3*3的整型二维数组,写一个函数,当主函数调用此函数后,能求出平均值、最大值和最小值.

有一个3*3的整型二维数组,写一个函数,当主函数调用此函数后,能求出平均值、最大值和最小值.
如题,是C语言

#include <iostream>
using namespace std;
void num_calc(int array[3][3],double & aver_num,int & max_num,int & min_num);
int main()
{
int a[3][3] = { 1,2,3,
7,8,9,
4,5,6 };
int max_num,min_num;
double aver_num;

num_calc(a,aver_num,max_num,min_num);

// print the number,you also can use "printf" with library stdio.h included.
cout << "The average number is:" << aver_num << endl;
cout << "The max number is:" << max_num << endl;
cout << "The min number is:" << min_num << endl;
}
void aver_calc(int array[3][3],double & aver_num)
{
int sum = 0;
for(int i = 0; i < 3; i++)
for(int j = 0; j < 3; j++)
{
sum += array[i][j];
}
aver_num = sum / 9.0;
}
void max_calc(int array[3][3],int & max_num)
{
max_num = array[0][0];
for(int i = 0; i < 3; i++)
for(int j = 0; j < 3; j++)
{
if(max_num < array[i][j])
max_num = array[i][j];
}
}
void min_calc(int array[3][3],int & min_num)
{
min_num = array[0][0];
for(int i = 0; i < 3; i++)
for(int j = 0; j < 3; j++)
{
if(min_num > array[i][j])
min_num = array[i][j];
}
}
void num_calc(int array[3][3],double & aver_num,int & max_num,int & min_num)
{
aver_calc(array,aver_num);
max_calc(array,max_num);
min_calc(array,min_num);
}