项目1-深复制的体验（3）

#include<iostream>
#include<cstring>
using namespace std;
class A
{
private:
    char *a;
public:
    A(char *aa)
    {
        a = new char[strlen(aa)+1];  //

        strcpy(a, aa);  //

    }
    ~A()
    {
        delete []a;   //

    }
    void output()
    {
        cout<<a<<endl;
    }
};
int main(){
    A a("good morning, code monkeys!");
    a.output();
    A b("good afternoon, codes!");
    b.output();
    return 0;
}

（3）为类A增加复制构造函数，用下面的main函数测试

int main()
{
    A a("good morning, code monkeys!");
    a.output();
    A b(a);
    b.output();
    return 0;
}

#include<iostream>
#include<cstring>
using namespace std;
class A
{
private:
    char *a;
public:
    A(char *aa)
    {
        a = new char[strlen(aa)+1];
        strcpy(a,aa);
    }
    A(A &b)
    {
        a = new char[strlen(b.a)+1];
        strcpy(a,b.a);
    }
    ~A()
    {
        delete []a;
    }
    void output()
    {
        cout<<a<<endl;
    }
};
int main(){
    A a("good morning, code monkeys!");
    a.output();
    A b(a);
    b.output();
    return 0;
}