Why the RationalNumber constructor is a conversion constructor in C++?

[hero0765]

hi:
a RationalNumber class is declared as follows:
class RationalNumber
{
public:
RationalNumber(int num = 0, int denom = 1) :
numerator(num), denominator(denom) {}
private:
int numerator, denominator;
};

Explain why the RationalNumber constructor is a conversion constructor.

 

[mstealth]

Think about how the constructor uses the arguments when a new instance of Rational Number is created.