返回:贺老师课程教学链接
(1)
#include <iostream> using namespace std; class A { public: A() { cout<<"A"; } ~A() { cout<<"~A"; } }; class B { A *p; public: B() { cout<<"B"; p=new A(); } ~B() { cout<<"~B"; delete p; } }; int main() { B obj; return 0; }
(2)
#include <iostream> using namespace std; class MyClass { public: MyClass(int x=0):i(x) { cout<<"C"<<i; } ~MyClass() { cout<<"D"<<i; } void SetValue(int val) { i=val; } int GetVal() { return i; } private: int i; }; int main() { MyClass *p[3]; int i; for (i=0; i<3; i++) { p[i]=new MyClass(i); p[i]->SetValue(p[i]->GetVal()*2); } for (i=0; i<3; i++) delete p[i]; cout<<endl; return 0; }
(3)
#include <iostream> using namespace std; class B { public: B() { cout<<"default constructor"<<endl; } ~B() { cout<<"destructed"<<endl; } B(int i):data(i) { cout<<"constructed: " << data <<endl; } private: int data; }; B Play(B b) { return b ; } int main() { B temp = Play(5); return 0; }
(4)
#include <iostream> using namespace std; class example { public: example() { cout<<"Default Constructing! "<<endl; } example(int n) { i=n; cout<<"Constructing: "<<i<<endl; } ~example() { cout <<"Destructing: "<<i<<endl; } int get_i() { return i; } private: int i; }; int sqr_it(example o) { return o.get_i()* o.get_i(); } int main() { example x(10); cout<<x.get_i()<<endl; cout<<sqr_it(x)<<endl; return 0; }
(5)
#include <iostream> using namespace std; class AA { public: AA(int i,int j) { A=i; B=j; cout<<"Constructor\n"; } AA(AA &obj) { A=obj.A+1; B=obj.B+2; cout<<"Copy_Constructor\n"; } ~AA() { cout<<"Destructor\n"; } void print() { cout<<"A="<<A<<",B="<<B<<endl; } private: int A,B; }; int main() { AA a1(2,3); AA a2(a1); a2.print(); AA *pa=new AA(5,6); pa->print(); delete pa; return 0; }