嘻唰唰第一批之对象的转换

代码

#include <iostream>
#include<cstring>
#include<iomanip>
#include<cstdio>
using namespace std;
class Student
{
    int num;
    char *name;
    char sex;
    float score;
public:
    Student(int nu,char *na,char a,float s=0):num(nu),sex(a),score(s)
    {
        name=new char[strlen(na)+1];
        strcpy(name,na);
    }
    void display()
    {
        cout<<"num:"<<num<<endl<<"name"<<":"<<name;
        cout<<endl<<"sex:"<<sex<<endl<<"score:"<<score<<endl;

    }
    friend class Teacher;
};
class Teacher
{
    int num;
    char *name;
    char sex;
    float pay;
public:
    Teacher(int nu,char *na,char a,float p):num(nu),sex(a),pay(p)
    {
        name=new char[strlen(na)+1];
        strcpy(name,na);
    }
    Teacher(Student&s)
    {
        num=s.num;
        name=new char[strlen(s.name)];
        strcpy(name,s.name);
        sex=s.sex;
    }
    void setpay(float n)
    {
        pay=n;
    }
    void display()
    {
        cout<<"num:"<<num;
        cout<<endl<<"name:"<<name<<endl;
        cout<<"sex:"<<sex<<endl<<"pay:"<<pay<<endl;
    }
};
int main()

{

    cout<<setiosflags(ios::fixed);

    cout<<setprecision(2);

    int num;

    char name[20];

    char sex;

    float score;

    float pay;

    cin>>num>>name>>sex>>pay;

    Teacher teacher1(num,name,sex,pay);

    cin>>num>>name>>sex>>score;

    Student student1(num,name,sex,score);

    cout<<"student1:"<<endl;

    student1.display();

    Teacher teacher2=Teacher(student1);

    teacher2.setpay(1500);

    cout<<"teacher2:"<<endl;

    teacher2.display();

    return 0;

}

 

总结：

但是不知道脑子抽的什么风，就写了中间位置的一个参数赋初值，结果老是错错错，可怜我还愣是不知道哪儿错了，唉。。。。。

结果是因为这个。。。后面带实参的话会有些问题，若实参数目不足，只会是最后一个形参接收不到实参，而形参列表里又没有初始化，就没有值
public:
    Student(int nu=1,char *na,char a,float s=0)