C++的实验

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编程：建立一个分数类。分数类的数据成员包括分子和分母，操作包括约分、通分、加、减、乘、除、求倒数、比较、显示和输入。分数类的定义如下：

//l.h

class fraction{

int above;

int below;

void reduction();

void makecommond(fraction);

public:

fraction(int a=0,int b=1);

fraction add(fraction);

fraction sub(fraction);

fraction mul(fraction);

fraction div(fraction);

fraction reciprocal();

bool equal(fraction);

bool greaterthan(fraction);

bool lessthan(fraction);

void display();

void input();

};

//l.cpp

#include "l.h"

#include <iostream>

using namespace std;

void fraction::reduction(){

int a=above,b=below,c;

for(c=a%b;c!=0;a=b,b=c,c=a%b);

above=above/b;

below=below/b;

}

void fraction::makecommond(fraction f){

int b=below,b1=f.below,c;

for(c=b1%b;c!=0;b1=b,b=c,c=b1%b);

below=(f.below*below/b);

above=(f.below*below/b)/below*above;

}

fraction::fraction(int a,int b){

above=a;

below=b;

}

fraction fraction::add(fraction f){

fraction t;

makecommond(f);

t.above=above+f.above*below/f.below;

t.below=below;

t.reduction();

return t;

}

fraction fraction::sub(fraction f){

fraction t;

makecommond( f);

t.above=above-f.above*below/f.below;

t.below=below;

t.reduction();

return t;

}

fraction fraction::mul(fraction f){

fraction t;

t.above=f.above*above;

t.below=f.below*below;

t.reduction();

return t;

}

fraction fraction::div(fraction f){

fraction t;

t.below=f.above*below;

t.above=f.below*above;

t.reduction();

return t;

}

fraction fraction::reciprocal(){

fraction t;

t.above=below;

t.below=above;

t.reduction();

return t;

}

bool fraction::equal(fraction f){

makecommond(f);

if(above==f.above*below/f.below)

return true;

}

bool fraction::greaterthan(fraction f){

makecommond(f);

if(above>f.above*below/f.below)

return true;

}

bool fraction::lessthan(fraction f){

makecommond(f);

if(above<f.above*below/f.below)

return true;

}

void fraction::display(){

cout<<above<<"/"<<below<<endl;

}

void fraction::input(){

cout<<"请输入above="<<endl;

cin>>above;

cout<<"请输入below="<<endl;

cin>>below;

}

//main.cpp

#include "l.h"

#include <iostream>

using namespace std;

int main(){

fraction f1,f2,f3;

int a,b,c;

f1.input();

f2.input();

f3=f1.add(f2);

cout<<"加法结果："<<endl;

f3.display();

f3=f1.sub(f2);

cout<<"减法结果："<<endl;

f3.display();

f3=f1.mul(f2);

cout<<"乘法结果："<<endl;

f3.display();

f3=f1.div(f2);

cout<<"除法结果："<<endl;

f3.display();

f3=f1.reciprocal();

cout<<"求倒结果："<<endl;

f3.display();

a=f1.equal(f2);

b=f1.greaterthan(f2);

c=f1.lessthan(f2);

if(a==1)

cout<<"两数相等！"<<endl;

else if(b==1)

cout<<"前数要大！"<<endl;

else if(c==1)

cout<<"后数要大！"<<endl;

return 0;

}