C ++ overload auto-increment and auto-subtraction Operators

#include<iostream>#include<cstdlib>using namespace std;class Pair{public:Pair(int firstPart, int secondPart);Pair operator++();Pair operator++(int);void setFirstPart(int firstPart);void setSecondPart(int secondPart);int getFirstPart() const; int getSecondPart() const;private:int firstPart;int secondPart;};int main(){Pair a(1, 2);cout<<"Postfix a++:";cout<<a.getFirstPart()<<" "<<a.getSecondPart()<<endl;Pair b = a++;cout<<"Postfix b++:";cout<<b.getFirstPart()<<" "<<b.getSecondPart()<<endl;cout<<a.getFirstPart()<<" "<<a.getSecondPart()<<endl;a = Pair(1, 2);cout<<"Prefix ++a:";cout<<a.getFirstPart()<<" "<<a.getSecondPart()<<endl;Pair c = ++a;cout<<"Postfix c++:";cout<<c.getFirstPart()<<" "<<c.getSecondPart()<<endl;cout<<a.getFirstPart()<<" "<<a.getSecondPart()<<endl;}Pair::Pair(int firstPart, int secondPart):firstPart(firstPart),secondPart(secondPart){}Pair Pair::operator++(){firstPart++;secondPart++;return Pair(firstPart, secondPart);}Pair Pair::operator++(int flag){int temp1 = firstPart;int temp2 = secondPart;firstPart++;secondPart++;return Pair(temp1, temp2);}int Pair::getFirstPart() const{return firstPart;}int Pair::getSecondPart() const{return secondPart;}void Pair::setFirstPart(int firstPart){this->firstPart= firstPart;}void Pair::setSecondPart(int secondPart){this->secondPart = secondPart;}

The above is the code for reloading the auto-increment operator. The auto-increment operator is similar. Note: an int type parameter in an auto-increment function with a suffix is only a sign of the compiler and is not used in the function.