Intermediate values in C++

Question

I can not find how to implement a design in C++. In the language of Delphi in case the operator can write the following design:

    case s[j] of
         '0'..'9','A'..'Z','a'..'z','_': doSomeThing();

How can i do the same in c++. Attracts me is the construction type 'a' .. 'z' and etc...

Thank you

Answer 1

You can do it using isalnum function as:

if(isalnum(s[j]) || (s[j] == '_') )