Question

求一个VC++计算器程序

具有加减乘除，取倒，取反，存储的功能

Answer 1

#include<iostream>
using namespace std;
class Fraction
{
private:
int numtor;
int dentor;
public:
Fraction();
Fraction(int n,int d){numtor=n;dentor=d;}

~Fraction(){cout<<"constructor"<<endl;};
Fraction operator-(); //运算符-（）用于对数值取负
Fraction operator+();//运算符+（）用于对保持数值不变
Fraction operator!();//运算符!（）用于对反转数值
friend Fraction operator+(Fraction&fra1,Fraction&fra2);//运算符+（）用于相加两个Faraction对象
friend Fraction operator*(Fraction&fra1,Fraction&fra2);//运算符*（）用于相乘两个Faraction对象
void display();
};
Fraction::Fraction()
{
numtor=0;
dentor=1;
}
Fraction Fraction::operator-()//运算符-（）用于对数值取负

{
int d=dentor;
int n=(-numtor);
Fraction f(n,d);
return f;

}
Fraction Fraction:: operator+()//运算符+（）用于对保持数值不变
{
int n=numtor;
int d=dentor;
Fraction f(n,d);
return f;
}
Fraction Fraction::operator!()//运算符!（）用于对反转数值
{
int n=dentor;
int d=numtor;
Fraction f(n,d);
return f;
}
void Fraction::display()
{
cout<<numtor<<"/"<<dentor<<endl;
}

//*****************************
Fraction operator+(Fraction& fra1,Fraction& fra2)//运算符+（）用于相加两个Faraction对象
{
int n=fra1.numtor*fra2.dentor+fra1.dentor*fra2.numtor;
int d=fra1.dentor*fra2.dentor ;

Fraction f(n,d);
return f;
}
Fraction operator*(Fraction& fra1,Fraction& fra2)//运算符*（）用于相乘两个Faraction对象
{
int n=fra1.numtor*fra2.numtor ;
int d=fra1.dentor*fra2.dentor;

Fraction f(n,d);
return f;
}
int main()
{
Fraction fra1(5,8);
Fraction fra2(2,7);
Fraction fra3;
Fraction fra4;
(-fra1).display();

(+fra1).display();
(!fra1).display();

//fra3=fra1+fra2;
//fra4=fra1*fra2;
(fra1+fra2).display();
(fra1*fra2).display();
system("pause");
return 0;
}