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#include<iostream>
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using namespace std;
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class Calc
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{
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protected: //private로 한 경우 하위 클래스에서 변수를 상속받지 못함
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int a;
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int b;
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int c;
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public:
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Calc();
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Calc(int new_A, int new_B);
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~Calc();
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void Prn();
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};
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Calc::Calc()
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{
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a=0;
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b=0;
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c=0;
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cout<<"\n [Calc class 생성자 실행]"<<endl;
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}
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Calc::Calc(int new_A,int new_B)
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{
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a=new_A;
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b=new_B;
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c=0;
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cout<<"\n [Calc class 생성자 실행]"<<endl;
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}
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Calc::~Calc()
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{
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cout<<" [Calc class 소멸자 실행]\n"<<endl;
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}
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void Calc::Prn()
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{
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cout<<
" "<<a<<
"\t"<<b<<
"\t"<<c<<endl;
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}
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class Add:public Calc
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{
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public:
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Add(int new_A, int new_B);
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Add();
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~Add();
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void Sum();
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void Prn();
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};
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Add::Add() :Calc()
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{
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cout<<" [Add class 생성자 실행]"<<endl;
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}
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Add::Add(int new_A, int new_B) :Calc(new_A,new_B)
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{
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cout<<" [Add class 생성자 실행]"<<endl;
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}
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Add::~Add()
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{
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cout<<" [Add class 소멸자 실행]"<<endl;
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}
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void Add::Sum()
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{
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c=a+b;
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}
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void Add::Prn()
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{
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cout<<
" "<<a<<
" + "<<b<<
" = "<<c<<endl;
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}
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class Mul:public Calc
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{
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public:
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Mul(int new_A, int new_B);
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Mul();
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~Mul();
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void Gob();
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void Prn();
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};
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Mul::Mul() :Calc()
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{
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cout<<" [Mul class 생성자 실행]"<<endl;
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}
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Mul::Mul(int new_A, int new_B) :Calc(new_A,new_B)
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{
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cout<<" [Mul class 생성자 실행]"<<endl;
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}
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Mul::~Mul()
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{
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cout<<" [Mul class 소멸자 실행]"<<endl;
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}
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void Mul::Gob()
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{
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c=a*b;
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}
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void Mul::Prn()
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{
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cout<<
" "<<a<<
" * "<<b<<
" = "<<c<<endl;
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}
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void main()
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{
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Calc a;
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cout<<" Calc a;"<<endl;
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a.Prn();
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Add b;
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cout<<" Add b;"<<endl;
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b.Calc::Prn();
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b.Sum();
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b.Prn();
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Add c(5,5);
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cout<<" Add c(5,5);"<<endl;
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c.Calc::Prn();
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c.Sum();
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c.Prn();
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Mul d;
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cout<<" Mul d;"<<endl;
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d.Calc::Prn();
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d.Gob();
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d.Prn();
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Mul e(3,3);
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cout<<" Mul e(3,3);"<<endl;
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e.Calc::Prn();
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e.Gob();
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e.Prn();
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cout<<"\n # sizeof()를 이용하여 각 클래스의 크기 출력"<<endl;
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cout<<"\n sizeof(a) = "<<sizeof(a)<<endl;
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cout<<" sizeof(b) = "<<sizeof(b)<<endl;
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cout<<" sizeof(c) = "<<sizeof(b)<<endl;
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cout<<" sizeof(d) = "<<sizeof(b)<<endl;
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cout<<" sizeof(e) = "<<sizeof(c)<<endl<<endl;
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}
용희