C++操练篇----类和对象

来源：互联网发布：网络研修困惑编辑：程序博客网时间：2024/04/28 03:53

程序一：直角三角形，就斜边长和面积

#include <iostream>#include <cstdlib>#include <math.h>using namespace std;class Triangle{public:    Triangle(double aa,double bb)    {        a=aa;        b=bb;    }    double hypot()    {        return sqrt(a*a+b*b);    }    double area()    {        return 0.5*a*b;    }private:    double a;    double b;};int main(){   Triangle tri(3,4);    cout << "斜边长：" <<tri.hypot()<<endl;    cout << "面积为：" <<tri.area()<<endl;    return 0;}

程序二，一个学生类，获取学生信息，设置学生信息，修改学生专业

#include <iostream>#include <cstdlib>#include <math.h>using namespace std;class Student{public:    Student(){;}    //定义一个不带参数的默认构造函数    void getInfo()    {        cout<<"学生学号为：\t"<<num<<"姓名：\t"<<name<<"性别：\t"<<sex<<"年龄：\t"<<age<<"专业：\t"<<major<<endl;    }    void setInfo(string snum,string sname,string ssex,int sage,string smajor)    {        this->num=snum;        this->name=sname;        this->sex=ssex;        this->age=sage;        this->major=smajor;    }    bool modifyMajor(string maj)    {       this->major=maj;       return true;    }private:    string name;    string sex;    int age;    string major;    string num;};int main(){    Student a;              //定义一个学生对象，在栈中给它分配存储空间；    Student *p=new Student;  //定义一个学生对象，在堆中给它分配存储空间；    p->setInfo("1107","srf","nan",24,"soft engineering");    a.setInfo("1108","dp","nv",23,"soft engineering");    a.getInfo();    a.modifyMajor("computer science");    a.getInfo();    p->getInfo();    return 0;}

程序三：