What is the difference between widening and narrowing in c++ ?
What is meant by casting and what are the types of casting ?
What is the difference between widening and narrowing in c++ ? What is meant
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What is the difference between widening and narrowing in c++ ?
What is meant by casting and what are the types of casting ?
This is a general casting thing, not C++ specific.
A “widening” cast is a cast from one type to another, where the “destination” type has a larger range or precision than the “source” (e.g. int to long, float to double). A “narrowing” cast is the exact opposite (long to int). A narrowing cast introduces the possibility of overflow.
Widening casts between built-in primitives are implicit, meaning you do not have to specify the new type with the cast operator, unless you want the type to be treated as the wider type during a calculation. By default, types are cast to the widest actual type used on the variable’s side of a binary expression or assignment, not counting any types on the other side).
Narrowing casts, on the other hand, must be explicitly cast, and overflow exceptions must be handled unless the code is marked as not being checked for overflow (the keyword in C# is
unchecked; I do not know if it’s unique to that language)