isdigit problem error false

[kevin42]

I'm trying to validate a string (char) input. I'm using the IsDigit function. Here is my Code.

#include <cctype>
#include <iostream>

using namespace std;



int main()
{
  	  
 	cout << "Enter Anything" << endl;
 	
 	char a_char;
 	
 	cin >> a_char;

    if(isdigit(a_char))
    {
        cout<<"Is a digit!";
    }
    else
    {
        cout<<"Is not a digit!";
    }
    cout << endl;
    

    int end;
    cin >> end;

}

It all goes well when I insert a number, but the program just stops when I insert I char. I need to be able to test for both. How?? Please Help. Thanks

[redhead]

Well.. isdigit() takes a single byte representation of an int, and tells you if the value is within {0, 1, 2, ..., 9}, any given char can be seen as an int representing any of the the values {0, 1, 2, ..., 255} so, when your input is a number, which seen as a single char can only represent values within the orriginal {0, 1, 2, ..., 9}, but when given a char ie 'c', it will infact be converted to the int value 99, which is way beond the scope for isdigit() to check.
Testing for chars, you'd might want to take a look at isascii(), which is not part of the ISO/ANSI definition, so perhaps a combination of

if(isdigit(a_char))
    // an int
else
    if(isprint(a_char))
        // a printable char besides int
    else
        // must be something else

If this dosn't give you a hint, then you might give a better description on what you're trying to achieve here, since from what I can tell it looks as if you want to test if input is a char or an int.

[kevin42]

Wowzas it worked. Thx cool guy! You r0ck4z3r!

[redhead]

Thats what we're here for, to help people find solutions to their problems