本文主要是介绍第六周项目阅读程序3,4,5,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
问题及代码3:
/*
*Copyright (c)2014,烟台大学计算机与控制工程学院
*All rights reserved.
*文件名称:test.cpp
*作 者:尚 月
*完成日期:2015年04月11日
*版 本 号:v1.0
*
*问题描述:阅读下列程序
*输出描述:无
*/
#include<iostream>
using namespace std;
class B
{
public:
B()
{
cout<<"default constructor"<<endl;
}
~B()
{
cout<<"destructde"<<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;
}
测试结果:constructed: 5
destructde
destructde
运行结果:constructed: 5
destructde
destructde
问题及代码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;
}
预测结果:
Constructing: 10
10
100
Destructing: 10
Destructing: 10
运行结果:
Constructing: 10
10
100
Destructing: 10
Destructing: 10
问题及代码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;
}
预测结果:
Constructor
Copy_constructor
A=3 , B=5
Constructor
A=5 , B=6
Destructor
Destructor
Destructor
运行结果:
Constructor
Copy_constructor
A=3 , B=5
Constructor
A=5 , B=6
Destructor
Destructor
Destructor
学习总结:先理解阅读程序,为后面的项目做铺垫。
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