大神进，谁能做粗来，我拜他为师

Design a new class to represent a fraction (a ration of two integer values).
The data members of the class Fraction are two integers top and bottom, denoting the
numerator and denominator, respectively.
class Fraction
{
private:
int top; // Numerator
int bottom; // Denominator
public:
. . . . . .
}