#include <iostream>
#include <cstring>
using namespace std;
class Array2 {
// 在此处补充你的代码
};
int main() {
Array2 a(3,4);
int i,j;
for( i = 0;i < 3; ++i )
for( j = 0; j < 4; j ++ )
a[i][j] = i * 4 + j;
for( i = 0;i < 3; ++i ) {
for( j = 0; j < 4; j ++ ) {
cout << a(i,j) << ",";
}
cout << endl;
}
cout << "next" << endl;
Array2 b; b = a;
for( i = 0;i < 3; ++i ) {
for( j = 0; j < 4; j ++ ) {
cout << b[i][j] << ",";
}
cout << endl;
}
return 0;
}
首先上面代码说明a有一个私有成员二维数组
private:
int arr[10][10];
注意到这里a是一个类实例,又出现a[i][j]说明有一个[]重载,即
int* Array2::operator [](int i)
{
return arr[i]; //它是二维数组arr的第i个元素,即第i个小数组的首地址,故返回值类型应该为int*
}
cout<<a(i,j)这里又是一个重载,实际上是(i,j)重载
//重载操作符 '()'
int Array2::operator()(int i, int j)
{
return arr[i][j];
}
接下来是两个构造函数
//建立默认构造函数
Array2::Array2()
{
for (int i = 0; i < 10; i++)
for (int j = 0; j < 10; j++)
{
arr[i][j] = 0;
}
}
//建立构造函数,初始化二维数组arr
Array2::Array2(int a, int b)
{
for (int i = 0; i < a; i++)
for (int j = 0; j < b; j++)
{
arr[i][j] = 0;
}
}
b=a 只用重载拷贝函数即行
Array2::Array2(Array2& c)
{
for (int i = 0; i < 10; i++)
for (int j = 0; j < 10; j++)
{
arr[i][j] = c.arr[i][j];
}
}
完整代码
#include <iostream>
#include <cstring>
using namespace std;
// 在此处补充你的代码
//定义一个类Array2
//要重载操作符'[]',支持二维数组下标
//要重载操作符 '()'
//要进行深度拷贝,建立自己的拷贝构造函数
class Array2
{
private:
int arr[10][10];
public:
Array2();
Array2(int, int);
int* operator [](int i);
int operator()(int i, int j);
Array2(Array2& c);
};
//建立默认构造函数
Array2::Array2()
{
for (int i = 0; i < 10; i++)
for (int j = 0; j < 10; j++)
{
arr[i][j] = 0;
}
}
//建立构造函数,初始化二维数组arr
Array2::Array2(int a, int b)
{
for (int i = 0; i < a; i++)
for (int j = 0; j < b; j++)
{
arr[i][j] = 0;
}
}
//重载操作符'[]',支持二维数组下标
int* Array2::operator [](int i)
{
return arr[i]; //它是二维数组arr的第i个元素,即第i个小数组的首地址,故返回值类型应该为int*
}
//重载操作符 '()'
int Array2::operator()(int i, int j)
{
return arr[i][j];
}
//建立自己的拷贝构造函数,进行深度拷贝
Array2::Array2(Array2& c)
{
for (int i = 0; i < 10; i++)
for (int j = 0; j < 10; j++)
{
arr[i][j] = c.arr[i][j];
}
}
int main() {
Array2 a(3, 4);
int i, j;
for (i = 0; i < 3; ++i)
for (j = 0; j < 4; j++)
a[i][j] = i * 4 + j; //说明要重载操作符'[]',支持二维数组下标
for (i = 0; i < 3; ++i) {
for (j = 0; j < 4; j++) {
cout << a(i, j) << ","; //说明要重载操作符 '()'
}
cout << endl;
}
cout << "next" << endl;
Array2 b; b = a; //说明要进行深度拷贝
for (i = 0; i < 3; ++i) {
for (j = 0; j < 4; j++) {
cout << b[i][j] << ",";
}
cout << endl;
}
return 0;
}