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*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);
- }
- 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w3xue。