isdigit help with validation function

[Zeeth]

Basically I'm entering an integer like 3, and it's saying its not an int.

Any help would be greatly appreciated.

#include <iostream>
#include <ctype.h>
using namespace std;


class IntRange
{
    private:
       int input;
       int lowest;
       int highest;


    public:
       IntRange(int, int);
       int getInt();
};


IntRange::IntRange(int lower, int upper)
{
    lowest = lower;
    highest = upper;


}


IntRange::getInt()
{


    cin >> input;


    while ((input < lowest) || (input > highest) || (isdigit(input) == 0))
    {
        cout << "That is not a valid input, please enter a number between " << lowest << " and " << highest << endl;
        cin >> input;
    }


    return input;
}


int main()
{
    int number;
    cout << "please enter a number" << endl;


    IntRange validate(1, 4);


    number = validate.getInt();


    cout << number;






    return 0;
}

[itsme86]

isdigit() is meant to be used on an ASCII character. For example, isdigit('3') would return true where as isdigit('f') would return false.

[Zeeth]

so I need to pass it a char not a int? Thanks.

[gardhr]

so I need to pass it a char not a int? Thanks.

Yes, but in this case you aren't reading characters directly (you're using an istream object to parse the input), so you just need to check the stream state of 'cin' with istream::fail().