下面的float初始化之间有什么区别？

Question

Initialization of float can be done as follows,

float a = 0.0
float a = 0.f
float a = float(0)

Is there any pros and cons to use any of these?

Answer 1

It doesn't matter at all. You could also say float a = 0; and again it would be the same thing. Or float a = float(); . I think the most conventional would be 0 , 0.0 , or 0f ; the rest are just redundant.

Answer 2

The first initializes from a double literal, whereas the second is from a float literal. The bits in the two zeros may not be the same.

The third is c++ constructor-like syntax that actually just does direct initialization, in this case from an integer literal.