c++分数类基本操作

//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。

#include

using namespace std;

class fraction{

int above; //分子

int below; //分母

void reduction(); //约分

void makecommond(fraction &); //通分

public:

fraction(int=0,int=1);

fraction add(fraction);

fraction sub(fraction);

fraction mul(fraction);

fraction div(fraction);

fraction reciprocal(); //求倒数

bool equal(fraction); //等于运算

bool greaterthan(fraction); //大于运算

bool lessthan(fraction); //小于运算

void display(); //显示

void input(); //输入

};

fraction::fraction(int i,int j){

above=i,below=j;

}

void fraction::reduction(){ // 约分

int a,b,t;

if(below<0&&above>0)

above=-above,below=-below;

a=abs(above),b=abs(below),t=a%b;

while(t){

a=b,b=t,t=a%b;

}

above/=b,below/=b;

}

void fraction::makecommond(fraction &a){ // 通分

int t;

reduction();

a.reduction();

above*=a.below,a.above*=below,t=below*a.below;

below=a.below=t;

}

fraction fraction::add(fraction a){ // 加法fraction t;

makecommond(a);

t.above=above+a.above;

t.below=below;

t.reduction();

return t;

}

fraction fraction::sub(fraction a){ // 减法fraction t;

makecommond(a);

t.above=above-a.above;

t.below=below;

t.reduction();

return t;

}

fraction fraction::mul(fraction a){ // 乘法fraction t;

makecommond(a);

t.above=above*a.above;

t.below=below*below;

t.reduction();

return t;

}

fraction fraction::div(fraction a){ // 除法fraction t;

makecommond(a);

t.above=above*a.below;

t.below=below*a.above;

t.reduction();

return t;

}

fraction fraction::reciprocal(){ //取倒数fraction t;

t.above=below,t.below=above;

return t;

}

bool fraction::equal(fraction a){ //等于

makecommond(a);

return above==a.above;

}

bool fraction::greaterthan(fraction a){ //大于makecommond(a);

return above>a.above;

}

bool fraction::lessthan(fraction a){ //小于

makecommond(a);

return above

}

void fraction::display(){ // 输出

reduction();

cout<

}

void fraction::input(){ //输入

cin>>above>>below;

if(below==0)

{

cout<<"输入错误!分母不能为零!"<

exit(1);

}

}

int main(){

fraction f1,f2,f3,f4;

cout<<"input f1(分子分母):";

f1.input();

cout<<"input f2(分子分母):";

f2.input();

f3=f1.add(f2);

cout<<"f3=f1+f2=";

f3.display();

f3=f1.sub(f2);

cout<<"f3=f1-f2=";

f3.display();

f3=f1.mul(f2);

cout<<"f3=f1*f2=";

f3.display();

f3=f1.div(f2);

cout<<"f3=f1/f2=";

f3.display();

f4=f3.reciprocal();

cout<<"f4=1/f3=";

f4.display();

if(f1.equal(f2))

cout<<"f1=f2"<

if(f1.greaterthan(f2))

cout<<"f1>f2"<

if(f1.lessthan(f2))

cout<<"f1

return 0;

}