C++函数运算符重载

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#include<string.h>
using namespace std;
class fraction
{
friend fraction operator+(const fraction &a, const fraction &b);
public:
fraction() :
num(1),
den(1)
{}
fraction(int n, int d) :
num(n),
den(d)
{}
//类操作符
/* fraction operator+(const fraction & other)
{
fraction result;
result.den = den*other.den;
result.num = den*result.num + num*result.den;
return result;
}
*/
private:
int num;
int den;
};
//重载全局操作符：
fraction operator+(const fraction &a, const fraction &b)
{
fraction result;
result.den = a.den*b.den;
result.num = a.num*b.den + a.den*b.num;
return result;
}


int main()
{
fraction fa(2, 5);
fraction fb(3, 5);
fraction fc = fa + fb;
return 0;

}