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Light-City
2020-04-06 00:57:02 +08:00
parent f97c156cc4
commit a4d828bb4c
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22
practical_exercises/10_day_practice/day5/构造函数与析构函数/readme.md Normal file
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40
practical_exercises/10_day_practice/day5/构造函数与析构函数/构造函数调用次序.cpp Normal file
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//Eg6-12.cpp
#include <iostream>
using namespace std;
class A {
int x;
public:
A(int i=0) {
x=i;
cout << "A-----"<<x<<endl;
}
};
class B {
int y;
public:
B(int i) {
y=i;
cout << "B-----"<<y<<endl;
}
};
class C {
int z;
public:
C(int i) {
z=i;
cout << "C-----"<<z<<endl;
}
};
class D : public B{
public:
C c1, c2;
A *a1 = new A(10);
A a0,a4;
D( ) : a4(4),c2(2),c1(1),B(1) {
cout << "D-----5"<<endl;
}
};
int main(){
D d;
system("pause");
}

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practical_exercises/10_day_practice/day5/构造函数与析构函数/构造顺序.cpp Normal file
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#include<iostream>
using namespace std;
/*
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*/
class A {
public:
A() { cout<<"Constructing A"<<endl;}
~A(){ cout<<"Destructing A"<<endl;}
};
class B {
public:
B() { cout<<"Constructing B"<<endl;}
~B(){ cout<<"Destructing B"<<endl;}
};
class C
{
public:
C() { cout<<"Constructing C"<<endl;}
~C(){ cout<<"Destructing C"<<endl;}
B b;
A a;
};
int main()
{
C c;
system("pause");
}
/*
ִ<EFBFBD>н<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
Constructing B
Constructing A
Constructing C
Destructing C
Destructing A
Destructing B
*/

15
practical_exercises/10_day_practice/day5/构造函数与析构函数/没有构造函数的派生类.cpp Normal file
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#include <iostream>
using namespace std;
class A {
public:
A(){ cout<<"Constructing A"<<endl; }
~A(){ cout<<"Destructing A"<<endl; }
};
class B:public A {
public:
~B(){ cout<<"Destructing B"<<endl; }
};
int main(){
B b;
system("pause");
}

27
practical_exercises/10_day_practice/day5/构造函数与析构函数/派生类构造函数.cpp Normal file
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#include <iostream>
using namespace std;
class Base{
private:
int x;
public:
Base(int a){
x=a;
cout<<"Base constructor x="<<x<<endl;
}
~Base(){ cout<<"Base destructor..."<<endl; }
};
class Derived:public Base{
private:
int y;
public:
Derived(int a,int b):Base(a){ //<2F><><EFBFBD><EFBFBD><EFBFBD>๹<EFBFBD>캯<EFBFBD><ECBAAF><EFBFBD>ij<EFBFBD>ʼ<EFBFBD><CABC><EFBFBD>б<EFBFBD>
y=b;
cout<<"Derived constructor y="<<y<<endl;
}
~Derived(){ cout<<"Derived destructor..."<<endl; }
};
int main(){
Derived d(1,2);
system("pause");
return 0;
}

46
practical_exercises/10_day_practice/day5/构造函数与析构函数/派生类构造函数调用顺序.cpp Normal file
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#include<iostream>
using namespace std;
class A {
public:
A() { cout<<"Constructing A"<<endl;}
~A(){ cout<<"Destructing A"<<endl;}
};
class B {
public:
B() { cout<<"Constructing B"<<endl;}
~B(){ cout<<"Destructing B"<<endl;}
};
class C {
public:
C() { cout<<"Constructing C"<<endl;}
~C(){ cout<<"Destructing C"<<endl;}
};
class D:public C
{
public:
D() { cout<<"Constructing D"<<endl;}
~D(){ cout<<"Destructing D"<<endl;}
B b;
A a;
C c;
};
int main()
{
D d;
system("pause");
}
/*
ִ<EFBFBD>н<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
Constructing C
Constructing B
Constructing A
Constructing C
Constructing D
Destructing D
Destructing C
Destructing A
Destructing B
Destructing C
*/

24
practical_exercises/10_day_practice/day5/构造函数与析构函数/派生类给基类传递参数.cpp Normal file
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#include <iostream>
using namespace std;
class Point{
protected:
int x,y;
public:
Point(int a,int b=0) {
x=a; y=b;
cout<<"constructing point("<<x<<","<<y<<")"<<endl;
}
};
class Line:public Point{
protected:
int len;
public:
Line(int a,int b,int l):Point(a,b) { //<2F><><EFBFBD>캯<EFBFBD><ECBAAF><EFBFBD><EFBFBD>ʼ<EFBFBD><CABC><EFBFBD>б<EFBFBD>
len=l;
cout<<"Constructing Line,len ..."<<len<<endl;
}
};
int main(){
Line L1(1,2,3);
system("pause");
}