幾個典型運(yùn)算符重載(C++)(四)

7.3幾個典型運(yùn)算符重載2023/1/131編輯課件7.3幾個典型運(yùn)算符重載數(shù)學(xué)類中常用的幾個運(yùn)算重載的特點(diǎn)和應(yīng)用

6.3幾個典型運(yùn)算符重載2023/1/132編輯課件7.3.1重載++

與--

設(shè) AAobject；運(yùn)算符++和--有兩種方式：前置方式：

++Aobject --Aobject后置方式：

Aobject

++ Aobject--成員函數(shù)

重載 A::Aoperator++();

解釋為： Aobject.operator++();

友員函數(shù)

重載 friendAoperator++(A&);

解釋為： operator++(Aobject);

成員函數(shù)

重載 A::Aoperator++(int);

解釋為： Aobject.operator++(0);

友員函數(shù)

重載： friendAoperator++(A&,int);

解釋為： operator++(Aobject,0)偽參數(shù)6.3.1重載++與--2023/1/133編輯課件成員函數(shù)重載++#include<iostream.h>classIncrease{public:Increase(){value=0;}voiddisplay()const{cout<<value<<'\n';};Increaseoperator++(); //前置

Increaseoperator++(int); //后置

private:unsignedvalue;};IncreaseIncrease::operator++() {value++;return*this;} IncreaseIncrease::operator++(int) {Increasetemp;temp.value=value++;returntemp;}voidmain(){Increasea,b,n;for(inti=0;i<10;i++)a=n++;cout<<"n=";n.display();cout<<"a=";a.display();for(i=0;i<10;i++)b=++n;cout<<"n=";n.display();cout<<"b=";b.display();}6.3.1重載++與--2023/1/134編輯課件成員函數(shù)重載++#include<iostream.h>classIncrease{public:Increase(){value=0;}voiddisplay()const{cout<<value<<'\n';};

Increaseoperator++();

//前置

Increaseoperator++(int); //后置

private:unsignedvalue;};IncreaseIncrease::operator++() {value++;return*this;}

IncreaseIncrease::operator++(int) {Increasetemp;temp.value=value++;returntemp;}voidmain(){Increasea,b,n;for(inti=0;i<10;i++)a=n++;cout<<"n=";n.display();cout<<"a=";a.display();for(i=0;i<10;i++)b=++n;cout<<"n=";n.display();cout<<"b=";b.display();}Increaseoperator++();IncreaseIncrease::operator++(){value++;return*this;}++n;預(yù)定義版本6.3.1重載++與--2023/1/135編輯課件成員函數(shù)重載++#include<iostream.h>classIncrease{public:Increase(){value=0;}voiddisplay()const{cout<<value<<'\n';};

Increaseoperator++();

//前置

Increaseoperator++(int); //后置

private:unsignedvalue;};IncreaseIncrease::operator++() {value++;return*this;}

IncreaseIncrease::operator++(int) {Increasetemp;temp.value=value++;returntemp;}voidmain(){Increasea,b,n;for(inti=0;i<10;i++)a=n++;cout<<"n=";n.display();cout<<"a=";a.display();for(i=0;i<10;i++)b=++n;cout<<"n=";n.display();cout<<"b=";b.display();}Increaseoperator++();IncreaseIncrease::operator++(){value++;return*this;}++n;重載版本6.3.1重載++與--2023/1/136編輯課件成員函數(shù)重載++#include<iostream.h>classIncrease{public:Increase(){value=0;}voiddisplay()const{cout<<value<<'\n';};Increaseoperator++(); //前置

Increaseoperator++(int);//后置

private:unsignedvalue;};IncreaseIncrease::operator++() {value++;return*this;} IncreaseIncrease::operator++(int) {Increasetemp;temp.value=value++;returntemp;}voidmain(){Increasea,b,n;for(inti=0;i<10;i++)a=n++;cout<<"n=";n.display();cout<<"a=";a.display();for(i=0;i<10;i++)b=++n;cout<<"n=";n.display();cout<<"b=";b.display();}Increaseoperator++(int);IncreaseIncrease::operator++(int) {Increasetemp;temp.value=value++;returntemp;}n++;預(yù)定義版本6.3.1重載++與--2023/1/137編輯課件成員函數(shù)重載++#include<iostream.h>classIncrease{public:Increase(){value=0;}voiddisplay()const{cout<<value<<'\n';};Increaseoperator++(); //前置

Increaseoperator++(int);//后置

private:unsignedvalue;};IncreaseIncrease::operator++() {value++;return*this;} IncreaseIncrease::operator++(int) {Increasetemp;temp.value=value++;returntemp;}voidmain(){Increasea,b,n;for(inti=0;i<10;i++)a=n++;cout<<"n=";n.display();cout<<"a=";a.display();for(i=0;i<10;i++)b=++n;cout<<"n=";n.display();cout<<"b=";b.display();}Increaseoperator++(int);IncreaseIncrease::operator++(int) {Increasetemp;temp.value=value++;returntemp;}n++;重載版本6.3.1重載++與--2023/1/138編輯課件成員函數(shù)重載++#include<iostream.h>classIncrease{public:Increase(){value=0;}voiddisplay()const{cout<<value<<'\n';};Increaseoperator++(); //前置

Increaseoperator++(int);//后置

private:unsignedvalue;};IncreaseIncrease::operator++() {value++;return*this;} IncreaseIncrease::operator++(int) {Increasetemp;temp.value=value++;returntemp;}voidmain(){Increasea,b,n;for(inti=0;i<10;i++)a=n++;cout<<"n=";n.display();cout<<"a=";a.display();for(i=0;i<10;i++)b=++n;cout<<"n=";n.display();cout<<"b=";b.display();}6.3.1重載++與--2023/1/139編輯課件友員函數(shù)重載++#include<iostream.h>classIncrease{public:Increase(){value=0;}voiddisplay()const{cout<<value<<'\n';};friendIncreaseoperator++(Increase&); //前置

friendIncreaseoperator++(Increase&,int); //后置

private:unsignedvalue;};Increaseoperator++(Increase&a){a.value++;returna;} Increaseoperator++(Increase&a,int){Increasetemp(a);a.value++;returntemp;}voidmain(){Increasea,b,n;for(inti=0;i<10;i++)a=n++;cout<<"n=";n.display();cout<<"a=";a.display();for(i=0;i<10;i++)b=++n;cout<<"n=";n.display();cout<<"b=";b.display();}6.3.1重載++與--2023/1/1310編輯課件友員函數(shù)重載++#include<iostream.h>classIncrease{public:Increase(){value=0;}voiddisplay()const{cout<<value<<'\n';};

friendIncreaseoperator++(Increase&);

//前置

friendIncreaseoperator++(Increase&,int); //后置

private:unsignedvalue;};Increaseoperator++(Increase&a){a.value++;returna;}

Increaseoperator++(Increase&a,int){Increasetemp(a);a.value++;returntemp;}voidmain(){Increasea,b,n;for(inti=0;i<10;i++)a=n++;cout<<"n=";n.display();cout<<"a=";a.display();for(i=0;i<10;i++)b=++n;cout<<"n=";n.display();cout<<"b=";b.display();}friendIncreaseoperator++(Increase&);Increaseoperator++(Increase&a){a.value++;returna;}++n;通過引用參數(shù)操作對象6.3.1重載++與--2023/1/1311編輯課件友員函數(shù)重載++#include<iostream.h>classIncrease{public:Increase(){value=0;}voiddisplay()const{cout<<value<<'\n';};friendIncreaseoperator++(Increase&); //前置

friendIncreaseoperator++(Increase&,int);

//后置

private:unsignedvalue;};Increaseoperator++(Increase&a){a.value++;returna;} Increaseoperator++(Increase&a,int){Increasetemp(a);a.value++;returntemp;}voidmain(){Increasea,b,n;for(inti=0;i<10;i++)a=n++;cout<<"n=";n.display();cout<<"a=";a.display();for(i=0;i<10;i++)b=++n;cout<<"n=";n.display();cout<<"b=";b.display();}friendIncreaseoperator++(Increase&,int);Increaseoperator++(Increase&a,int){Increasetemp(a);a.value++;returntemp;}n++;復(fù)制構(gòu)造局部對象6.3.1重載++與--2023/1/1312編輯課件友員函數(shù)重載++#include<iostream.h>classIncrease{public:Increase(){value=0;}voiddisplay()const{cout<<value<<'\n';};friendIncreaseoperator++(Increase&); //前置

friendIncreaseoperator++(Increase&,int);

//后置

private:unsignedvalue;};Increaseoperator++(Increase&a){a.value++;returna;} Increaseoperator++(Increase&a,int){Increasetemp(a);a.value++;returntemp;}voidmain(){Increasea,b,n;for(inti=0;i<10;i++)a=n++;cout<<"n=";n.display();cout<<"a=";a.display();for(i=0;i<10;i++)b=++n;cout<<"n=";n.display();cout<<"b=";b.display();}friendIncreaseoperator++(Increase&,int);Increaseoperator++(Increase&a,int){Increasetemp(a);a.value++;returntemp;}n++;偽參數(shù)6.3.1重載++與--2023/1/1313編輯課件友員函數(shù)重載++#include<iostream.h>classIncrease{public:Increase(){value=0;}voiddisplay()const{cout<<value<<'\n';};friendIncreaseoperator++(Increase&); //前置

friendIncreaseoperator++(Increase&,int); //后置

private:unsignedvalue;};Increaseoperator++(Increase&a){a.value++;returna;} Increaseoperator++(Increase&a,int){Increasetemp(a);a.value++;returntemp;}voidmain(){Increasea,b,n;for(inti=0;i<10;i++)a=n++;cout<<"n=";n.display();cout<<"a=";a.display();for(i=0;i<10;i++)b=++n;cout<<"n=";n.display();cout<<"b=";b.display();}6.3.1重載++與--2023/1/1314編輯課件7.3.2重載賦值運(yùn)算符賦值運(yùn)算符重載用于對象數(shù)據(jù)的復(fù)制

operator=必須重載為成員函數(shù)重載函數(shù)原型為：

類型

&類名

::operator=(const類名

&);

6.3.2重載賦值運(yùn)算符2023/1/1315編輯課件#include<iostream.h>#include<string.h>className{public:Name(char*pN);Name(constName&); //復(fù)制構(gòu)造函數(shù)

Name&operator=(constName&); //重載賦值算符

~Name();protected:char*pName;intsize;};voidmain(){NameObj1("ZhangSan");NameObj2=Obj1; //調(diào)用復(fù)制構(gòu)造函數(shù)

NameObj3("NoName");Obj3=Obj2=Obj1; //調(diào)用重載賦值算符函數(shù)

}定義Name類的重載賦值函數(shù)6.3.2重載賦值運(yùn)算符2023/1/1316編輯課件#include<iostream.h>#include<string.h>className{public:Name(char*pN);

Name(constName&);

//復(fù)制構(gòu)造函數(shù)

Name&operator=(constName&); //重載賦值算符

~Name();protected:char*pName;intsize;};voidmain(){NameObj1("ZhangSan");

NameObj2=Obj1;

//調(diào)用復(fù)制構(gòu)造函數(shù)

NameObj3("NoName");Obj3=Obj2=Obj1; //調(diào)用重載賦值算符函數(shù)

}定義Name類的重載賦值函數(shù)初始化對象時調(diào)用復(fù)制構(gòu)造函數(shù)6.3.2重載賦值運(yùn)算符2023/1/1317編輯課件#include<iostream.h>#include<string.h>className{public:Name(char*pN);Name(constName&); //復(fù)制構(gòu)造函數(shù)

Name&operator=(constName&);

//重載賦值算符

~Name();protected:char*pName;intsize;};voidmain(){NameObj1("ZhangSan");NameObj2=Obj1; //調(diào)用復(fù)制構(gòu)造函數(shù)

NameObj3("NoName");

Obj3=Obj2=Obj1;

//調(diào)用重載賦值算符函數(shù)

}定義Name類的重載賦值函數(shù)修改對象時調(diào)用重載賦值運(yùn)算符函數(shù)6.3.2重載賦值運(yùn)算符2023/1/1318編輯課件定義Name類的重載賦值函數(shù)Name::Name(char*pN){cout<<"Constructing"<<pN<<endl;pName=newchar[strlen(pN)+1];if(pName!=0)strcpy(pName,pN);size=strlen(pN);}Name::Name(constName&Obj) //復(fù)制構(gòu)造函數(shù){cout<<"Copying"<<Obj.pName<<"intoitsownblock\n";pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;}Name&Name::operator=(constName&Obj) //重載賦值算符{delete[]pName;pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;return*this;}Name::~Name(){cout<<"Destructing"<<pName<<endl;pName[0]='\0';delete[]pName;size=0;}Name&Name::operator=(constName&Obj){delete[]pName;pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;return*this;}ChengMingthis10this->sizeLiHaiObj6Obj.size6.3.2重載賦值運(yùn)算符2023/1/1319編輯課件Name::Name(char*pN){cout<<"Constructing"<<pN<<endl;pName=newchar[strlen(pN)+1];if(pName!=0)strcpy(pName,pN);size=strlen(pN);}Name::Name(constName&Obj) //復(fù)制構(gòu)造函數(shù){cout<<"Copying"<<Obj.pName<<"intoitsownblock\n";pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;}Name&Name::operator=(constName&Obj) //重載賦值算符{delete[]pName;pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;return*this;}Name::~Name(){cout<<"Destructing"<<pName<<endl;pName[0]='\0';delete[]pName;size=0;}定義Name類的重載賦值函數(shù)Name&Name::operator=(constName&Obj){delete[]pName;pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;return*this;}ChengMingthisLiHaiObj10this->size6Obj.size6.3.2重載賦值運(yùn)算符2023/1/1320編輯課件Name::Name(char*pN){cout<<"Constructing"<<pN<<endl;pName=newchar[strlen(pN)+1];if(pName!=0)strcpy(pName,pN);size=strlen(pN);}Name::Name(constName&Obj) //復(fù)制構(gòu)造函數(shù){cout<<"Copying"<<Obj.pName<<"intoitsownblock\n";pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;}Name&Name::operator=(constName&Obj) //重載賦值算符{delete[]pName;pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;return*this;}Name::~Name(){cout<<"Destructing"<<pName<<endl;pName[0]='\0';delete[]pName;size=0;}定義Name類的重載賦值函數(shù)Name&Name::operator=(constName&Obj){delete[]pName;

pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;return*this;}thisLiHaiObj10this->size6Obj.size6.3.2重載賦值運(yùn)算符2023/1/1321編輯課件Name::Name(char*pN){cout<<"Constructing"<<pN<<endl;pName=newchar[strlen(pN)+1];if(pName!=0)strcpy(pName,pN);size=strlen(pN);}Name::Name(constName&Obj) //復(fù)制構(gòu)造函數(shù){cout<<"Copying"<<Obj.pName<<"intoitsownblock\n";pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;}Name&Name::operator=(constName&Obj) //重載賦值算符{delete[]pName;pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;return*this;}Name::~Name(){cout<<"Destructing"<<pName<<endl;pName[0]='\0';delete[]pName;size=0;}定義Name類的重載賦值函數(shù)Name&Name::operator=(constName&Obj){delete[]pName;pName=newchar[strlen(Obj.pName)+1];

if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;return*this;}thisLiHaiObjLiHai10this->size6Obj.size6.3.2重載賦值運(yùn)算符2023/1/1322編輯課件Name::Name(char*pN){cout<<"Constructing"<<pN<<endl;pName=newchar[strlen(pN)+1];if(pName!=0)strcpy(pName,pN);size=strlen(pN);}Name::Name(constName&Obj) //復(fù)制構(gòu)造函數(shù){cout<<"Copying"<<Obj.pName<<"intoitsownblock\n";pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;}Name&Name::operator=(constName&Obj) //重載賦值算符{delete[]pName;pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;return*this;}Name::~Name(){cout<<"Destructing"<<pName<<endl;pName[0]='\0';delete[]pName;size=0;}定義Name類的重載賦值函數(shù)Name&Name::operator=(constName&Obj){delete[]pName;pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);

size=Obj.size;return*this;}thisLiHaiObjLiHai10this->size6Obj.size66.3.2重載賦值運(yùn)算符2023/1/1323編輯課件Name::Name(char*pN){cout<<"Constructing"<<pN<<endl;pName=newchar[strlen(pN)+1];if(pName!=0)strcpy(pName,pN);size=strlen(pN);}Name::Name(constName&Obj) //復(fù)制構(gòu)造函數(shù){cout<<"Copying"<<Obj.pName<<"intoitsownblock\n";pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;}Name&Name::operator=(constName&Obj) //重載賦值算符{delete[]pName;pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;return*this;}Name::~Name(){cout<<"Destructing"<<pName<<endl;pName[0]='\0';delete[]pName;size=0;}定義Name類的重載賦值函數(shù)Name&Name::operator=(constName&Obj){delete[]pName;pName=newchar[strlen(Obj.pName)+1];if(pName!=0)strcpy(pName,Obj.pName);size=Obj.size;

return*this;}thisLiHaiObjLiHai6this->size6Obj.size6.3.2重載賦值運(yùn)算符2023/1/1324編輯課件#include<iostream.h>#include<string.h>className{public:Name(char*pN);Name(constName&); //復(fù)制構(gòu)造函數(shù)

Name&operator=(constName&); //重載賦值算符

~Name();protected:char*pName;intsize;};voidmain(){NameObj1("ZhangSan");NameObj2=Obj1; //調(diào)用復(fù)制構(gòu)造函數(shù)

NameObj3("NoName");Obj3=Obj2=Obj1; //調(diào)用重載賦值算符函數(shù)

}定義Name類的重載賦值函數(shù)6.3.2重載賦值運(yùn)算符2023/1/1325編輯課件#include<iostream.h>#include<string.h>className{public:Name(char*pN);Name(constName&); //復(fù)制構(gòu)造函數(shù)

Name&operator=(constName&); //重載賦值算符

~Name();protected:char*pName;intsize;};voidmain(){NameObj1("ZhangSan");NameObj2=Obj1; //調(diào)用復(fù)制構(gòu)造函數(shù)

NameObj3("NoName");Obj3=Obj2=Obj1; //調(diào)用重載賦值算符函數(shù)

}定義Name類的重載賦值函數(shù)構(gòu)造對象6.3.2重載賦值運(yùn)算符2023/1/1326編輯課件#include<iostream.h>#include<string.h>className{public:Name(char*pN);Name(constName&); //復(fù)制構(gòu)造函數(shù)

Name&operator=(constName&); //重載賦值算符

~Name();protected:char*pName;intsize;};voidmain(){NameObj1("ZhangSan");

NameObj2=Obj1;

//調(diào)用復(fù)制構(gòu)造函數(shù)

NameObj3("NoName");Obj3=Obj2=Obj1; //調(diào)用重載賦值算符函數(shù)

}定義Name類的重載賦值函數(shù)復(fù)制構(gòu)造對象6.3.2重載賦值運(yùn)算符2023/1/1327編輯課件#include<iostream.h>#include<string.h>className{public:Name(char*pN);Name(constName&); //復(fù)制構(gòu)造函數(shù)

Name&operator=(constName&); //重載賦值算符

~Name();protected:char*pName;intsize;};voidmain(){NameObj1("ZhangSan");NameObj2=Obj1; //調(diào)用復(fù)制構(gòu)造函數(shù)

NameObj3("NoName");Obj3=Obj2=Obj1; //調(diào)用重載賦值算符函數(shù)

}定義Name類的重載賦值函數(shù)構(gòu)造對象6.3.2重載賦值運(yùn)算符2023/1/1328編輯課件#include<iostream.h>#include<string.h>className{public:Name(char*pN);Name(constName&); //復(fù)制構(gòu)造函數(shù)

Name&operator=(constName&); //重載賦值算符

~Name();protected:char*pName;intsize;};voidmain(){NameObj1("ZhangSan");NameObj2=Obj1; //調(diào)用復(fù)制構(gòu)造函數(shù)

NameObj3("NoName");

Obj3=Obj2=Obj1;

//調(diào)用重載賦值算符函數(shù)

}定義Name類的重載賦值函數(shù)析構(gòu)賦值操作后的對象6.3.2重載賦值運(yùn)算符2023/1/1329編輯課件7.3.3重載運(yùn)算符[]和()運(yùn)算符[]和()是二元運(yùn)算符

[]和()只能用成員函數(shù)重載，不能用友元函數(shù)重載6.3.3重載運(yùn)算符[]和()2023/1/1330編輯課件1．重載下標(biāo)算符[]

重載格式

類

::類型

operator[](類型

)；[]運(yùn)算符用于訪問數(shù)據(jù)對象的元素6.3.3重載運(yùn)算符[]和()2023/1/1331編輯課件1．重載下標(biāo)算符[]

重載格式

類

::類型

operator[](類型

)；[]運(yùn)算符用于訪問數(shù)據(jù)對象的元素定義重載函數(shù)的類名6.3.3重載運(yùn)算符[]和()2023/1/1332編輯課件1．重載下標(biāo)算符[]

重載格式

類

::類型

operator[][類型

]；[]運(yùn)算符用于訪問數(shù)據(jù)對象的元素函數(shù)返回類型6.3.3重載運(yùn)算符[]和()2023/1/1333編輯課件1．重載下標(biāo)算符[]

重載格式

類

::類型

operator[](類型

)；[]運(yùn)算符用于訪問數(shù)據(jù)對象的元素函數(shù)名6.3.3重載運(yùn)算符[]和()2023/1/1334編輯課件1．重載下標(biāo)算符[]

重載格式

類

::類型

operator[](類型

)；[]運(yùn)算符用于訪問數(shù)據(jù)對象的元素右操作數(shù)為符合原語義，用int6.3.3重載運(yùn)算符[]和()2023/1/1335編輯課件1．重載下標(biāo)算符[]

重載格式

類

::類型

operator()[類型

]；[]運(yùn)算符用于訪問數(shù)據(jù)對象的元素例 設(shè)x是類X的一個對象，則表達(dá)式

x[y]

可被解釋為

x.operator[](y)顯式聲明一個參數(shù)6.3.3重載運(yùn)算符[]和()2023/1/1336編輯課件2．重載函數(shù)調(diào)用符()

//用重載()算符實(shí)現(xiàn)數(shù)學(xué)函數(shù)的抽象#include<iostream.h>classF{public:doubleoperator()(doublex,doubley);};doubleF::operator()(doublex,doubley){returnx*x+y*y;}voidmain() {Ff;cout<<f(5.2,2.5)<<endl;}6.3.3重載運(yùn)算符[]和()2023/1/1337編輯課件2．重載函數(shù)調(diào)用符()

//用重載()算符實(shí)現(xiàn)數(shù)學(xué)函數(shù)的抽象#include<iostream.h>classF{public:doubleoperator()(doublex,doubley);};doubleF::operator()(doublex,doubley){returnx*x+y*y;}voidmain() {Ff;cout<<f(5.2,2.5)<<endl;}f.operator()(5.2,2.5)6.3.3重載運(yùn)算符[]和()2023/1/1338編輯課件2．重載函數(shù)調(diào)用符()

//用重載()算符實(shí)現(xiàn)數(shù)學(xué)函數(shù)的抽象#include<iostream.h>classF{public:doubleoperator()(doublex,doubley);};doubleF::operator()(doublex,doubley){returnx*x+y*y;}voidmain() {Ff;cout<<f(5.2,2.5)<<endl;}memFunmemFunf.memFun(5.2,2.5)

比較定義普通成員函數(shù)6.3.3重載運(yùn)算符[]和()2023/1/1339編輯課件istream

和ostream

是C++的預(yù)定義流類cin

是istream

的對象，cout

是ostream

的對象運(yùn)算符<<由ostream

重載為插入操作，用于輸出基本類型數(shù)據(jù)運(yùn)算符>>由istream

重載為提取操作，用于輸入基本類型數(shù)據(jù)程序員重載<<和>>，用于輸出和輸入用戶自定義的數(shù)據(jù)類型7.3.4重載流插入和流提取運(yùn)算符6.3.4重載流插入和流提取運(yùn)算符2023/1/1340編輯課件#include<iostream.h>#include<stdlib.h>classvector{public:vector(intsize=1);~vector();int&operator[](inti);friendostream&operator<<(ostream&output,vector&);friendistream&operator>>(istream&input,vector&);private:int*v;intlen;};voidmain(){intk;cout<<"InputthelengthofvectorA:\n";cin>>k;vectorA(k);cout<<"InputtheelementsofvectorA:\n";cin>>A;cout<<"OutputtheelementsofvectorA:\n";cout<<A;}為vector類重載流插入運(yùn)算符和提取運(yùn)算符6.3.4重載流插入和流提取運(yùn)算符2023/1/1341編輯課件#include<iostream.h>#include<stdlib.h>classvector{public:vector(intsize=1);~vector();int&operator[](inti);friendostream&operator<<(ostream&output,vector&);friendistream&operator>>(istream&input,vector&);private:int*v;intlen;};voidmain(){intk;cout<<"InputthelengthofvectorA:\n";cin>>k;vectorA(k);cout<<"InputtheelementsofvectorA:\n";cin>>A;cout<<"OutputtheelementsofvectorA:\n";cout<<A;}為vector類重載流插入運(yùn)算符和提取運(yùn)算符重載幾個運(yùn)算符6.3.4重載流插入和流提取運(yùn)算符2023/1/1342編輯課件#include<iostream.h>#include<stdlib.h>classvector{public:vector(intsize=1);~vector();int&operator[](inti);friendostream&operator<<(ostream&output,vector&);friendistream&operator>>(istream&input,vector&);private:int*v;intlen;};voidmain(){intk;cout<<"InputthelengthofvectorA:\n";cin>>k;vectorA(k);cout<<"InputtheelementsofvectorA:\n";cin>>A;cout<<"OutputtheelementsofvectorA:\n";cout<<A;}為vector類重載流插入運(yùn)算符和提取運(yùn)算符標(biāo)準(zhǔn)流類6.3.4重載流插入和流提取運(yùn)算符2023/1/1343編輯課件#include<iostream.h>#include<stdlib.h>classvector{public:vector(intsize=1);~vector();int&operator[](inti);friendostream&operator<<(ostream&output,vector&);friendistream&operator>>(istream&input,vector&);private:int*v;intlen;};voidmain(){intk;cout<<"InputthelengthofvectorA:\n";cin>>k;vectorA(k);cout<<"InputtheelementsofvectorA:\n";cin>>A;cout<<"OutputtheelementsofvectorA:\n";cout<<A;}為vector類重載流插入運(yùn)算符和提取運(yùn)算符使用預(yù)定義版本6.3.4重載流插入和流提取運(yùn)算符2023/1/1344編輯課件#include<iostream.h>#include<stdlib.h>classvector{public:vector(intsize=1);~vector();int&operator[](inti);friendostream&operator<<(ostream&output,vector&);friendistream&operator>>(istream&input,vector&);private:int*v;intlen;};voidmain(){intk;cout<<"InputthelengthofvectorA:\n";cin>>k;

vectorA(k);cout<<"InputtheelementsofvectorA:\n";cin>>A;cout<<"OutputtheelementsofvectorA:\n";

cout<<A;}為vector類重載流插入運(yùn)算符和提取運(yùn)算符使用重載版本cin.operator>>(A)6.3.4重載流插入和流提取運(yùn)算符2023/1/1345編輯課件#include<iostream.h>#include<stdlib.h>classvector{public:vector(intsize=1);~vector();int&operator[](inti);friendostream&operator<<(ostream&output,vector&);friendistream&operator>>(istream&input,vector&);private:int*v;intlen;};voidmain(){intk;cout<<"InputthelengthofvectorA:\n";cin>>k;

vectorA(k);cout<<"InputtheelementsofvectorA:\n";cin>>A;cout<<"OutputtheelementsofvectorA:\n";

cout<<A;}為vector類重載流插入運(yùn)算符和提取運(yùn)算符使用重載版本cout.operator<<(A)6.3.4重載流插入和流提取運(yùn)算符2023/1/1346編輯課件vector::vector(intsize){if(size<=0||size>100){cout<<"Thesizeof"<<size<<"isnull!\n";abort();