Does anyone know the header file to include for isdigit and isalpha?
Header file for isdigit
Does anyone know the header file to include for isdigit and isalpha?
ctype.h
What does isdigit do
I am a C++ newb
using: Visual C++ 6.0
thanx for any Help
Code:# include<iostream> using namespace std; int main () { char number = '1'; if (isdigit(number)) cout << "Yes " << endl; return 0; }
compile this
Last edited by Betazep; 12-18-2001 at 01:00 AM.
Blue
isdigit can be found in iostream as well...
Imagine in the above program if the character held in 'number' was an 'a'.
Would "Yes " still be outputted to the screen. Well no... 'a' isn't a digit. '1' is a digit.
Pretty straightforward...
Blue
Basically how it's done:
Or, even more compactly, you could make a macro:Code:bool isdigit(char c) { if(c >= '0' && c <= '9') return true; return false; }
That's all there is to itCode:#define isdigit(c) ((c >= '0' && c <= '9') ? true : false)
