小编给大家分享一下C++有理数表达和计算的示例分析，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
#ifndef Rational_hpp#define Rational_hpp#include <stdio.h>#include <string>using namespace std;class Radtional{public: Radtional(); Radtional(int numerator,int denominator); int getNumerator()const; int getDemominator()const; Radtional add(const Radtional& secondRational); Radtional sub(const Radtional& secondRational); Radtional mult(const Radtional& secondRational); Radtional div(const Radtional& secondRational); int compareTo(const Radtional& secondRational); bool equals(const Radtional& secondRational); int intValue(); double doubleValue(); string toString();private: int numerator,denominator; static int gcd(int n,int d);};#endif #include "Rational.hpp"#include <sstream>#include <cstdlib>Radtional::Radtional(){ numerator = 0; denominator = 1;}Radtional::Radtional(int numerator,int denominator){ int factor = gcd(numerator, denominator); this->numerator = ((numerator>0) ? 1: -1)*abs(numerator)/factor; this->denominator = abs(denominator)/factor;}int Radtional::getNumerator()const{ return numerator;}int Radtional::getDemominator()const{ return denominator;}int Radtional::gcd(int n, int d){ int n1 = abs(n); int n2 = abs(d); int gcd =1; for (int i = 1; i<=n1&&i<=n2; i++) { if (n1%i==0&&n2%i==0) { gcd = i; } } return gcd;}Radtional Radtional::add(const Radtional& secondRational){ int n = numerator*secondRational.getDemominator()+denominator*secondRational.getNumerator(); int d = denominator * secondRational.getDemominator(); return Radtional(n,d);}Radtional Radtional::sub(const Radtional &secondRational){ int n = numerator * secondRational.getDemominator() - denominator* secondRational.getNumerator(); int d = denominator * secondRational.getDemominator(); return Radtional(n,d);}Radtional Radtional::mult(const Radtional &secondRational){ int n = numerator * secondRational.getNumerator(); int d = denominator * secondRational.getDemominator(); return Radtional(n,d);}Radtional Radtional::div(const Radtional &secondRational){ int n =numerator * secondRational.getDemominator(); int d =denominator * secondRational.getNumerator(); return Radtional(n,d);}int Radtional::compareTo(const Radtional &secondRational){ Radtional temp =sub(secondRational);//两值相减 if (temp.getNumerator()<0) { return -1; } else if (temp.getNumerator()==0){ return 0; } else return 1;}bool Radtional::equals(const Radtional &secondRational){ if (compareTo(secondRational)==0) { return true; } else return false;}int Radtional::intValue(){ return getNumerator()/getDemominator();}double Radtional::doubleValue(){ return 1.0*getNumerator()/getDemominator();}string Radtional::toString(){ stringstream ss; ss<<numerator; if (denominator>1) { ss<<"/"<<denominator; } return ss.str();}简单测试
#include <iostream>#include "Rational.hpp"int main(int argc, const char * argv[]) { // insert code here... Radtional a(3,2); Radtional b(2,5); Radtional c(1,3); Radtional d(2,6); cout<<a.toString()<<" + "<<b.toString()<<"="<<(a.add(b)).toString()<<endl; cout<<a.toString()<<" - "<<b.toString()<<"="<<(a.sub(b)).toString()<<endl; cout<<a.toString()<<" * "<<b.toString()<<"="<<(a.mult(b)).toString()<<endl; cout<<a.toString()<<" / "<<b.toString()<<"="<<(a.div(b)).toString()<<endl; cout<<c.toString()<<" - "<<a.toString()<<"="<<(c.sub(a)).toString()<<endl; cout<<c.toString()<<"的int转换为"<<c.intValue()<<endl; cout<<c.toString()<<"的double转换为"<<c.doubleValue()<<endl; cout<<c.toString()<<"和"<<a.toString()<<"比较结果"<<c.compareTo(a)<<endl; cout<<c.toString()<<"和"<<d.toString()<<"比较结果"<<c.compareTo(d)<<endl; cout<<b.toString()<<"和"<<a.toString()<<"比较结果"<<b.compareTo(a)<<endl; return 0;}测试结果
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