The final step needed to complete this stage of the rational type is to write assignment operators and to improve the constructors. It turns out C++ does some work for you, but you often want to fine-tune that work. Let’s find out how.
Assignment Operator
Until now, all the rational operators
have been free functions. The assignment operator is different. The C++ standard requires that it be a member function. One way to write this function is shown in Listing 33-1.
struct rational
{
rational(int num, int den)
: numerator{num}, denominator{den}
{
reduce();
}
rational& operator=(rational ...
