本文实例为大家分享了C++重载运算符实现分数加减乘除的具体代码，供大家参考，具体内容如下
实现结果如下图所示：
代码如下所示：
#include <iostream> using namespace std; class Rational {public: Rational operator+(Rational rhs); Rational operator-(Rational rhs); Rational operator*(Rational rhs); Rational operator/(Rational rhs); Rational(int num, int denom); private: void normalize(); //负责对分数做化简工作 int numerator;//分子 int denominator;//分母 friend std::ostream& operator<<(ostream& os, Rational f);}; Rational::Rational(int num, int denom) { numerator = num; denominator = denom; normalize();} //只允许分子为负数，若分母为负数则把负数挪到分子部分//利用欧几里得算法将分数简化void Rational::normalize() { if (denominator < 0) { numerator = -numerator; denominator = -denominator; } //欧几里得算法 int a = abs(numerator); int b = abs(denominator); //求出最大公约数,a //eg: a=12,b=9. //t=3 a=9 b=3 //t=0 a=3 b=0 while (b > 0) { int t = a % b;//t为余数 a = b; //a取除数 b = t; //b取余数 } //分子、分母分别处以最大公约数 numerator /= a; denominator /= a;} //重载运算符函数是类的成员函数//分数是先通分再加减// a*d+b*c / b*dRational Rational::operator+(Rational rhs) { int a = numerator; int b = denominator; int c = rhs.numerator; int d = rhs.denominator; return Rational(a*d+b*c,b*d);}Rational Rational::operator-(Rational rhs) { int a = numerator; int b = denominator; int c = rhs.numerator; int d = rhs.denominator; return Rational(a*d - b*c, b*d); /* **这里有个偷懒的写法 rhs.numerator = -rhs.numerator; return operator+(rhs); */}Rational Rational::operator*(Rational rhs) { int a = numerator; int b = denominator; int c = rhs.numerator; int d = rhs.denominator; return Rational(a*c, b*d);}Rational Rational::operator/(Rational rhs) { int t = rhs.denominator; rhs.denominator = rhs.numerator; rhs.numerator = t; return operator*(rhs);}//该函数是友元函数，因此不用加空间域名ostream& operator<<(ostream& os, Rational f); int main() { Rational r1(4, 18); Rational r2(14, 18); cout << r1 << " + " << r2 << " = " << (r1 + r2) << endl; cout << r1 << " - " << r2 << " = " << (r1 - r2) << endl; cout << r1 << " * " << r2 << " = " << (r1 * r2) << endl; cout << r1 << " / " << r2 << " = " << (r1 / r2) << endl; system("pause"); return 0;} ostream& operator<<(ostream& os, Rational f) { os << f.numerator << "/" << f.denominator; return os;}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
然后拍一些美得想哭的照片，留给老年的自己。
