1 <= W <= 100

[geezle86]

The first (and the only) input line contains integer number w (1 ≤ w ≤ 100)....

I just don't know how to say w=(1 ≤ w ≤ 100) in C++ language.

Is it

int w=(1 <= w <= 100); ?

thanks before.

[firedraco]

That is telling you what the input will contain, not that you are supposed to check that is the case.

[Chervil]

Exactly, it is just saying the input will consist of a number, and that it will lie within the range 1 to 100 inclusive. It's a description.