double number =10.9
int a ;
a = (int)number ;a = int(number) ;
- what are the difference between int() and (int) to convert de type into int
- if i use my own class BASE ; BASE() ; (BASE) ; what the difference?which is faster or unexpensive(cheap)?
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YiFan-Ou
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`int(number)` and `(int)number` are two different ways in C++ of achieving the same thing. Similar answer for user-defined classes, as long as the class supports a suitable constructor (or the expression being converted has a conversion operator). – Peter Feb 13 '22 at 08:01
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`(int)` is the c way. `int()` is the c++ way. `xxx_cast<>()` is the modern c++ way. – zdf Feb 13 '22 at 08:06
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@zdf - That's an opinion pushed by some. The `xxx_cast`s are more fine-grained and there are certainly use cases where they are preferable (e.g. catching some hard-to-detect errors that sail past the C-style cast or C++ function style cast). Declaring them as the "modern C++ way", particularly for a simple conversion between `double` and `int` where the errors won't occur, is bordering on zealotry though. – Peter Feb 13 '22 at 08:20
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@Peter Right, but I do not see a simpler way to explain it. – zdf Feb 13 '22 at 08:24