C++实验22

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一、类中类型转换函数重载

#include<iostream>using namespace std;#include<string>class student{    int idnum;    char name[20];    bool gender;    int age;    float grade_eng;    float grade_math;    float grade_phy;    float grade_cpp;public:    student(int a, char *b, bool c, int d, float e, float f, float g, float h)    {idnum=a;strcpy(name,b);gender=c;age=d;grade_eng=e;grade_math=f;grade_phy=g;grade_cpp=h;}    void show()    {        cout<<"ID\tName\tSex\tAge\tEnglish\tMath\tPhysics\t\C++"<<endl;        cout<<idnum<<'\t'<<name<<'\t';        if(gender)            cout<<"Man\t";        else            cout<<"Woman\t";        cout<<age<<'\t'<<grade_eng<<'\t'<<grade_math<<'\t'<<grade_phy<<'\t'<<grade_cpp<<endl;    }    operator float()    {        return (grade_eng+grade_math+grade_phy+grade_cpp)/4;    }};void main(){    student stu(20170101,"Zhangsan",true,20,90.1,80,75.4,100);    stu.show();    cout<<float(stu)<<endl;}

二、字符串类中运算符重载

//+=,==,-=,=,operator int#include<iostream>using namespace std;#include<string.h>class mystring{    char *str;public:    mystring(char *p)    {        str=new char[strlen(p)+1];        strcpy(str,p);    }    mystring(){str=NULL;}    ~mystring() {delete []str;}    void show()    {        if(str)            cout<<str<<endl;        else            cout<<"This str is NULL!\n";    }    mystring operator =(mystring &a)       //返回值未使用引用，因已自定义深拷贝构造函数    {        if(str)        {            cout<<"if str";            delete []str;        }        str=new char[strlen(a.str)+1];        strcpy(str,a.str);        return *this;    }    mystring & operator +=(mystring &a)    {        char *temp = new char[strlen(a.str)+strlen(str)+1];        strcpy(temp,str);        strcat(temp,a.str);        delete []str;        str=temp;        return *this;    }    mystring(mystring & a)    {        str=new char[strlen(a.str)+1];        strcpy(str,a.str);    }    friend bool operator ==(mystring &a,mystring &b);};bool operator ==(mystring &a, mystring &b){    if(strlen(a.str)!=strlen(b.str))        return false;    for(int i=0;i<strlen(a.str);i++)        if(a.str[i]!=b.str[i])            return false;    return true;}void main(){    mystring a("张三");                              a.show();    mystring b("李四");    b.show();    b+=a;    b.show();    mystring c(a);    cout<<(a==b)<<endl;    cout<<(a==c)<<endl;}

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