#include cctype and the isdigit

i am having a problem with the function isdigit from the library cctype. isdigit is suppose to return true if the agrument in isdigit is a digit between 0-9. but it keeps returning 0...
here is my code...help is appreciated.

Code:

---

#include <iostream>
#include <cctype>

using namespace std;

int main(void)
{

        int x = isdigit(5);
        cout << x;
        return 0;
}

---

thanks..

Try something like this...

Code:

---

#include <iostream>
#include <cctype>

using namespace std;

int main(void)
{
  char x;

  cout << "Enter Something: ";
  cin >> x;

  cout << isdigit( (int)x ) << endl;
       
  return 0;
}

---

>>int x = isdigit(5);
In this case you are looking at the decimal value of a character, not a 5 as you would type on your keyboard.

Try this instead:
>>int x = isdigit('5');

If you don't understand, have a look at the ASCII Chart. You'll see that 5 is an ENQ, whereas '5', which equates to a 5 on your keyboard (general terms), is actually a decimal 53 in ASCII.