The Fourth Dimension Space

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一個簡單的分數類

就是寫得太長了可以更精簡些的

#include <iostream>

using namespace std;

class CFraction

{

private:

int m_fractionSon; //分子

int m_fractionMother; //分母

friend ostream &operator<<(ostream &output,const CFraction &fraction)

{

output<<fraction.m_fractionSon<<"/"<<fraction.m_fractionMother<<endl;

return output;

}

friend istream &operator>>(istream &input, CFraction &fraction)

{

input>>fraction.m_fractionSon;

input>>fraction.m_fractionMother;

return input;

}

public:

CFraction(int=1 ,int=1 );

const CFraction operator+( const CFraction & );

const CFraction operator-( const CFraction & );

const CFraction operator*( const CFraction & );

const CFraction operator/( const CFraction & );

bool operator<( const CFraction & );

bool operator>( const CFraction & );

bool operator==( const CFraction & );

bool operator!=( const CFraction & );

CFraction Easiest(CFraction & ); //約分函數

int gcd(int a,int b); //求最大公約數函數

};

//類成員函數的定義

CFraction::CFraction(int fractionSon ,int fractionMother )

{

m_fractionSon = fractionSon; //構造函數不能有返回類型，

m_fractionMother = fractionMother;

}

const CFraction CFraction::operator+( const CFraction &rightNumber )

{

CFraction resultValue;

resultValue.m_fractionSon = m_fractionSon * rightNumber.m_fractionMother + m_fractionMother * rightNumber.m_fractionSon;

resultValue.m_fractionMother = m_fractionMother * rightNumber.m_fractionMother;

return Easiest( resultValue );

}

const CFraction CFraction::operator-( const CFraction &rightNumber )

{

CFraction resultValue;

resultValue.m_fractionSon = m_fractionSon * rightNumber.m_fractionMother - m_fractionMother * rightNumber.m_fractionSon;

resultValue.m_fractionMother = m_fractionMother * rightNumber.m_fractionMother;

return Easiest( resultValue );

}

const CFraction CFraction:: operator*(const CFraction &rightNumber )

{

CFraction resultValue;

resultValue.m_fractionSon = m_fractionSon * rightNumber.m_fractionSon;

resultValue.m_fractionMother = m_fractionMother * rightNumber.m_fractionMother;

return Easiest( resultValue );

}

const CFraction CFraction::operator/( const CFraction &rightNumber )

{

CFraction resultValue;

resultValue.m_fractionSon = m_fractionSon * rightNumber.m_fractionMother;

resultValue.m_fractionMother = m_fractionMother * rightNumber.m_fractionSon; //除以一個數等價于乘上這個數的倒數

return Easiest( resultValue );

}

bool CFraction::operator<( const CFraction &rightNumber )

{

int leftNumberFractionSon,rightNumberFractionSon;

leftNumberFractionSon = m_fractionSon * rightNumber.m_fractionMother;

rightNumberFractionSon = rightNumber.m_fractionSon * m_fractionMother;

if ( leftNumberFractionSon < rightNumberFractionSon )

{

return true;

}

else

{

return false;

}

bool CFraction::operator>( const CFraction &rightNumber)

{

int leftNumberFractionSon,rightNumberFractionSon;

leftNumberFractionSon = m_fractionSon * rightNumber.m_fractionMother;

rightNumberFractionSon = rightNumber.m_fractionSon * m_fractionMother;

if ( leftNumberFractionSon > rightNumberFractionSon )

{

return true;

}

else

{

return false;

}

bool CFraction::operator==( const CFraction &rightNumber )

{

int leftNumberFractionSon,rightNumberFractionSon;

leftNumberFractionSon = m_fractionSon * rightNumber.m_fractionMother;

rightNumberFractionSon = rightNumber.m_fractionSon * m_fractionMother;

if ( leftNumberFractionSon == rightNumberFractionSon )

{

return true;

}

else

{

return false;

}

CFraction CFraction::Easiest( CFraction &fraction )

{

int getgcd = gcd(fraction.m_fractionSon, fraction.m_fractionMother);

CFraction value(fraction.m_fractionSon/getgcd, fraction.m_fractionMother/getgcd);

return value;

}

int CFraction::gcd(int a,int b)

{

while(b)

{

int temp = b;

b = a%b;

a = temp;

}

return a;

}

int main()

{

int ason, amom, bson, bmom;

cout<<"請輸入分數a的分子:"<<endl;

cin>>ason;

cout<<"請輸入分數a的分母:"<<endl;

cin>>amom;

if ( amom == 0 )

{

cout<<"分母不能為0！"<<endl;

return 0;

}

cout<<"請輸入分數b的分子:"<<endl;

cin>>bson;

cout<<"請輸入分數b的分母:"<<endl;

cin>>bmom;

if ( bmom == 0 )

{

cout<<"分母不能為0！"<<endl;

return 0;

}

CFraction a(ason,amom);

CFraction b(bson,bmom);

cout<<"分數 a = "<< a <<endl;

cout<<"分數 b = "<< b <<endl;

cout<<"a+b="<< a+b <<endl;

cout<<"a-b="<< a-b <<endl;

cout<<"a*b="<< a*b <<endl;

cout<<"a/b="<< a/b <<endl;

if(a>b)

cout<<"a大于b"<<endl;

else if (a<b)

cout<<"a小于b."<<endl;

else if(a==b)

cout<<"a等于b."<<endl;

return 0;

}

轉自：http://blog.csdn.net/marine_lich/archive/2008/05/15/2449778.aspx

posted on 2010-04-16 18:09 abilitytao 閱讀(254) 評論(0) 編輯收藏引用

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The Fourth Dimension Space

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一個簡單的分數類