C++2021_Ex4_.rar

#include <iostream.h> #include <cmath> #include<stdlib.h> #include <iomanip.h> class fraction { private: int fz; //分子 int fm; //分母 void reduction();//约分 void makecommond(fraction&);//通分 public: fraction (int a=0,int b=1) //构造函数 { fz=a; fm=b; } friend fraction operator+(const fraction &,const fraction &); friend fraction operator-(const fraction &,const fraction &); friend fraction operator*(const fraction &,const fraction &); friend fraction operator/(const fraction &,const fraction &); fraction reciprocal(); //求倒数 bool operator==(fraction);//等于运算 bool operator>(fraction);//大于运算 bool operator<(fraction); //小于运算 void display(); //显示分数 void input(); //输入 fraction count(); //分数与浮点数或整数运算 }; void fraction::reduction() //约分 { int a,b,temp; if(fm<0) { fm=-fm; fz=-fz; } a=abs(fz); b=abs(fm); while(a%b) { temp=a; a=b; b=temp%b; } fz/=b; fm/=b; } void fraction::makecommond(fraction& b)//通分 { int temp; reduction(); b.reduction(); fz*=b.fm; b.fz*=fm; temp=fm*b.fm; fm=b.fm=temp; } fraction operator+(const fraction &a,const fraction &b)//友元加法 { fraction temp; temp.fz=a.fz*b.fm+b.fz*a.fm; temp.fm=a.fm*b.fm; return temp; } fraction operator-(const fraction &a,const fraction &b)//友元减法 { fraction temp; temp.fz=a.fz*b.fm-b.fz*a.fm; temp.fm=a.fm*b.fm; temp.reduction(); return temp; } fraction operator*(const fraction &a,const fraction &b)//友元乘法 { fraction temp; temp.fz=a.fz*b.fz; temp.fm=a.fm*b.fm; temp.reduction(); return temp; } fraction operator/(const fraction &a,const fraction &b)//友元除法 { fraction temp; if(b.fz==0) { cout<<"0不能作为除数"<<endl; exit(1); } temp.fz=a.fz*b.fm; temp.fm=a.fm*b.fz; temp.reduction(); return temp; } fraction fraction::reciprocal()//求倒数 { fraction temp; temp.fz=fm; temp.fm=fz; temp.reduction(); return temp; } fraction fraction::count()//与整数或浮点数运算 { cout<<"输入一个整数或者浮点数与分数进行运算（保留2位小数）"<<endl;; double x=fz; double y=fm; double z=x/y;//存放分数值 double i; //存放输入值 double num; //存放结果 cin>>i;//i为输入量 if(z>i)//分数与输入量比较大小 {cout<<fz<<"/"<<fm<<" > "<<i<<endl;} else if(z<i) {cout<<fz<<"/"<<fm<<" < "<<i<<endl;} else if(z==i) {cout<<fz<<"/"<<fm<<" == "<<i<<endl;} //加 num=z+i; cout<<fz<<"/"<<fm<<" + "<<i<<" = "; cout<<setiosflags(ios::fixed)<<setprecision(2)<<num<<endl; //减 num=z-i; cout<<fz<<"/"<<fm<<" - "<<i<<" = "; cout<<setiosflags(ios::fixed)<<setprecision(2)<<num<<endl; //乘 num=z*i; cout<<fz<<"/"<<fm<<" * "<<i<<" = "; cout<<setiosflags(ios::fixed)<<setprecision(2)<<num<<endl; //除 num=z/i; cout<<fz<<"/"<<fm<<" / "<<i<<" = "; cout<<setiosflags(ios::fixed)<<setprecision(2)<<num<<endl; return num; } bool fraction::operator==(fraction b)//比较相等 { makecommond(b); return(fz==b.fz); } bool fraction::operator>(fraction b)//比较大于 { makecommond(b); return(fz>b.fz); } bool fraction::operator<(fraction b)//比较小于 { makecommond(b); return(fz<b.fz); } void fraction::display()//打印显示 { reduction(); cout<<"为："<<fz<<"/"<<fm<<endl; } void fraction::input()//输入分数 { while(1) { cout<<"输入分子和分母，与下面的整数或浮点数运算："<<endl; cin>>fz>>fm; if(fm==0) { cout<<"分母不能为0"<<endl; } else { reduction(); return; } } } void main() { fraction f1(-3,-5),f2(-3,5),f3(3,-7),f4,f5(6),f7; cout<<"f1";f1.display(); cout<<"f2";f2.display(); cout<<"f3";f3.display(); cout<<"f4";f4.display(); cout<<"f5";f5.display(); if(f1>f2)//比较 cout<<"f1>f2"<<endl; if(f2<f3) cout<<"f2<f3"<<endl; if(f1==f1) cout<<"f1==f1"<<endl; f4=f1+f3;//加法 cout<<"f4=f1+f3="; f4.display(); f4=f1-f2;//减法 cout<<"f4=f1-f2"; f4.display(); f4=f1*f3;//乘法 cout<<"f4=f1*f3"; f4.display(); f4=f2/f3;//除法 cout<<"f4=f2/f3"; f4.display(); f4=f2.reciprocal();//求倒数 cout<<"f4=1/f2"; f4.display(); fraction f6=f1;//复制 cout<<"复制f1得到f6"; f6.display(); f7.input();//输入 cout<<"f7"; f7.display(); f4=f7.count();//分数与整数或浮点数计算 }