Objects can be type converted in C++, as shown in the following program:
#include<iostream>
class Fraction//Score
{
public:
Fraction (int num, int den = 1)
: m_numerator (num), m_denominator (den) {}
operator double() const
{
//return (m_numerator/(m_denominator*1.0));
return (m_numerator/(double)m_denominator);
}
private:
int m_numerator;//numerator
int m_denominator;//denominator
};
int main(int argc, char* argv[])
{
Fraction f(3,5);
double d1 = 4 + f;
std::cout <<"d1 = " << d1 << std::endl;
Fraction f1(4);
double d2 = 4 + f1;
std::cout << "d2 = " << d2 << std::endl;
return 0;
}
In this example, use operator double() const {} to convert the Fraction object to double type (numerator divided by denominator), and the result is shown in the following figure:
