プログラマ専用SNS ミクプラ

コード:

#include<string>
#include<sstream>
using namespace std;

int gcd(int x, int y){
    int r;

    if(x == 0 || y == 0){  // 引数チェック
        return 0;
    }

    // ユーグリッドの互除法
    while((r = x % y) != 0) { // yで割り切れるまでループ
        x = y;
        y = r;
    }
    return y;
}

class Bunsu{
private: 

	int bunbo,bunshi;


	void yakubun(){
		int num=gcd(bunshi,bunbo);
		if( num != 1 ){//互いに素でないなら
			bunshi/=num , bunbo/=num;
		}
	}
	
	string IntToString(int number){
	  stringstream ss;
	  ss << number;
	  return ss.str();
	}

public:	
    Bunsu(int a,int b){
		bunshi=a;
		bunbo=b;
		yakubun();
	}
	
	string tostr(){
		string str;
		
		str=IntToString(bunshi);
		str+="/";
		str+=IntToString(bunbo);
		
		return str;
	}
	
	void assign(int over,int under){
		bunshi=over;
		bunbo=under;
	}
	
	Bunsu& operator+ (const Bunsu &obj){
		bunbo= obj.bunbo * bunbo;
		
		bunshi= bunshi*obj.bunbo + obj.bunshi*bunbo ;
		
		yakubun();
		return *this;
	}
	
	Bunsu& operator= (const Bunsu &obj){
		bunbo= obj.bunbo;
		bunshi= obj.bunshi;
		return *this;
	}
	
	Bunsu& operator+= (const Bunsu &obj){
		bunbo+= obj.bunbo * bunbo;
		
		bunshi+= bunshi*obj.bunbo + obj.bunshi*bunbo ;
		yakubun();
		return *this;
	}
}

コード:

#include <iostream>
#include "bunsu.h"

int main(){

	Bunsu b1(1,3);
	Bunsu b2(16,6);
	Bunsu b3(1,1);
	
	cout << b2.tostr() << endl; // 8/3
	b3= b1+b2;
	cout<< b3.tostr() << endl;//3/1
	
	b3= b3+b1+b2;
	cout<< b3.tostr() << endl;//6/1
	
	b3+=b1 ;
	cout<<b3.tostr()<<endl;//19/3
	 
	b1=b2;
	cout <<b1.tostr() << endl;//8/3

	return 0;
}