function isdigit() is catching the caracter '»'

[noobiept]

Hello!
I'm writing a function to read input, and i want to have only numbers, so I used the function isdigit(). I then tested it out and the caracter '»' somehow seems to be considered a digit.

The code I have here is not the one I'm writing, is just a test to see if i can correct it. I wrote an if statement to get rid of the '»' caracter but it doesn't work, and i can't see why.

Hope you can help.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
char string[20];
int stringlenth = 0;


for ( ; ; )
{
    string[stringlenth] = getchar();

    if (string[stringlenth] == '\n')
        {
        string[stringlenth] = '\0';
        break;
        }

    if (isdigit(string[stringlenth]) != 0)
        {
        if (string[stringlenth] == '»') //this should get rid of the caracter... but it doesn't
            {
            continue;
            }
        printf ("%c" , string[stringlenth]);
        ++stringlenth;
        }

}
    return 0;
}

[kermit]

Without accounting for wide characters, your program will not deal well with things like '»'. If you want to test for input like that, see if you can incorporate <wctype.h> as opposed to <ctype.h>.

[noobiept]

didn't know that.
I've just test it out and worked. thanks kermit!