double - C++ difference between 0 and 0.0

Question

Is there a difference between 0 and 0.0 in C++? Which should you use for initializing a double?

Thanks

Answer 1

A literal 0 is considered to be an int literal; literal 0.0 is a double literal. When assigning to a double, either will work (since the int can be cast in a widening conversion); however, casting 0.0 to an int is a narrowing conversion, and must be done explicitly; i.e. (int)0.0.