重载操作符简例

#include 
    
     class Fraction{public:	Fraction()	{		numerator = 0;		denominator = 1;	}	Fraction(int a, int b)	{		numerator = a;		denominator = b;	}	Fraction operator + (const Fraction &other)//使分数类支持加法	{		Fraction result;		result.denominator = this->denominator * other.denominator;		result.numerator = this->numerator*other.denominator + other.numerator*this->denominator;		return result;	}	operator double()//使分数类支持向double的强制转换	{		return (double)numerator/denominator;	}	bool operator == (const Fraction &other)//如果两个分数相等则返回true，否则返回false	{		if (this->numerator*other.denominator == this->denominator * other.numerator)		{			return true;		}		return false;	}protected:private:	int numerator;	int denominator;};int main(){	Fraction a(2,3);	Fraction b(4,6);	double value = (double)a;	if (a == b)	{		printf("haha! %f\n", value);	}	return 0;}