In the above example, you can only perform a cast from Inch to Cm explicitly. That is, if you were to do this:
Cm cm1 = inch; // implicit cast
instead of this:
Cm cm1 = (Cm)inch; // explicit cast
You would get a compile-time error which reads: 'Cannot implicitly convert type Inch to Cm'.
It is possible to allow implicit casting by replacing the explicit keyword in the conversion method declaration by implicit. Instead of:
13: public static explicit operator Cm (Inch toConvert){
replacing the explicit keyword by implicit will enable implicit casting of an Inch object to a Cm type:
13: public static implicit operator Cm (Inch toConvert){
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