3.14 C++上机_牛客博客

构造函数与构析函数，复制构造函数，内敛成员函数，带默认形参值的成员函数，类的组合

#include <bits/stdc++.h>
#define cl(a) memset(a,0,sizeof(a))
using namespace std;
typedef long long ll;
const int maxn=1e5+50;

class date
{
    public:
    int year,mon,day;
    //date(int y,int m,int d):year(y),mon(m),day(d){}
};
class stuff
{
    private:
        int num;
        int sex;
        date born;
        string idnum;
    public:
        stuff(int num1,int sex1,string idnum1,date born1)
        {
            num=num1;
            idnum.clear();
            idnum+=idnum1;
            born.day=born1.day;
            sex=sex1;
            born.mon=born1.mon;
            born.year=born1.year;
        }

        stuff (stuff &a);
        void display()
        {
            printf("No.:%d\n",num);
            printf("sex：%d\n",sex);
            printf("id number: ");
            cout<<idnum<<endl;
            printf("born date:\ %d-%d-%d\n",born.year,born.mon,born.day);
        }
        ~stuff(){};
        int f(int num,int sex=0)
        {
            cout<<num<< " "<<sex<<endl;
        }

};
inline stuff::stuff(stuff &a)
{
    num=a.num;
    idnum+=a.idnum;
    born.day=a.born.day;
    born.mon=a.born.mon;
    born.year=a.born.year;
    sex=a.sex;
    printf("COPY CONSTRUCTOR\n");
}

int main()
{
    date d;
    d.year=2018;
    d.mon=3;
    d.day=14;
    stuff a(1,1,"110120119123456",d);
    a.display();
    stuff b(a);
    b.display();
    return 0;
}

二、
定义一个复数类Complex,使得下面的代码能够工作
Complex c1(3,5); //用复数3+5i初始化c1
Complex c2=4.5; //用实数4.5初始化c2
c1.add(c2); //将c1与c2相加,结果保存在c1中
c1.show(); //将c1输出（这时的结果应该是7.5+5i）

#include <bits/stdc++.h>
#define cl(a) memset(a,0,sizeof(a))
using namespace std;
typedef long long ll;
const int maxn=1e5+50;
class Complex
{
    private:
    double x;
    int i;
    public:
    Complex(double x1,int y1)
    {
        x=x1;
        i=y1;
    }
    Complex(double x1);
    void add(Complex c)
    {
        x+=c.x;
        i+=c.i;
    }

    void show()
    {
        printf("%lf + %di",x,i);
    }
};
Complex::Complex(double x1)
{
    x=x1;
    i=0;
}
int main()
{
    Complex c1(3,5);
    Complex c2=4.5;
    c1.add(c2);
    c1.show();
    return 0;
}

设计CPU类
//class header
enum CPU_Rank {P1=1,P2,P3,P4,P5,P6,P7};
class CPU
{
CPU_Rank rank;
int frequency;
float voltage;
//constructor for initialized instance varibles and display “construct a object”
//Destructor for display “destructure a object”;
//Get and set functions for each instance varible of the class
//Run() to display “CPU is runing”;
// Stop() to display CPU is stopped”;
//display information for a CPU
};

#include <bits/stdc++.h>
#define cl(a) memset(a,0,sizeof(a))
using namespace std;
typedef long long ll;
const int maxn=1e5+50;
enum CPU_Rank {P1=1,P2,P3,P4,P5,P6,P7};
class CPU
{
    CPU_Rank rank;
    int frequency;
    float voltage;
    public:
    CPU(int f, float v);
    ~CPU()
    {
        printf("destructure a object\n");
    };
    void Run()
    {
        printf("CPU is runing\n");
    }
    void Stop()
    {
        printf("CPU is stopped\n");
    }
    void display()
    {
        printf("frequency = %d ,voltage = %f\n",frequency,voltage);
    }
    void setnumf(int f)
    {
         frequency=f;
    }
    void setnumv(float t)
    {
        voltage=t;
    }
    int getF()
    {
        return frequency;
    }
    float getV()
    {
        return voltage;
    }
//constructor for initialized instance varibles and display “construct a object”
//Destructor for display “destructure a object”;
//Get and set functions for each instance varible of the class
//Run() to display “CPU is runing”;
    // Stop() to display CPU is stopped”;
//display information for a CPU
};
CPU::CPU(int f,float v)
{
    frequency=f;
    voltage=v;
    printf("construct a object\n");
}

int main()
{
    CPU a(10,1.3);
    a.Run();
    a.display();
    a.Stop();
    a.setnumf(7);
    a.display();
    a.setnumv(10.5);
    a.display();
    int f=a.getF();
    cout<<f<<endl;
    float t=a.getV();
    cout<<t<<endl;
    a.~CPU();
    return 0;
}