First Time, Please review...

**MyDestiny** · 02-09-2005

"Hello all - this is my first time on here but, I need some major help on my homework... yes, I know... I am not asking anyone to do it for me but, please explain to me how to do the program what I need it do. So let me break it down. Here's part of my program...

Code:

#include <iostream>
using namespace std;

void main ()
{
    char ch;
    int asc;

    do
    {

    cout<<"Enter a number or letter: \n";
    cin >> ch;
    asc=(int)ch;
    cout<<ch<<" "<<asc<<"\n";
                
    }
    while ((ch != 'q') && (ch !='Q'));
}

Okay this program is to display and ASCII code once a character is entered... but, here is my problem...

How do I put in my program that if it is NOT a letter or a number that is entered for "ch", then a message comes up "Incorrect character, please try again!".

I've been working on this problem for hours.... please help me.

Thanks.

MyDestiny

**pianorain** · 02-09-2005

You can use the isalpha function to determine if a character is an alphanumeric character or not.

Code:

int main()
{
    char a[2];
    a[0] = '?';
    a[1] = 'R';

    if (isalpha(a[0]))
        cout << "is alpha ?" << endl;
    if (isalpha(a[1]))
        cout << "is alpha R" << endl;
    return 0;
}

**major_small** · 02-09-2005

Originally Posted by pianorain

You can use the isalpha function to determine if a character is an alphanumeric character or not.

wrong! isalpha() returns non-zero if it's a letter in the alphabet. to test if it's a number or character, you need to use isalnum(), also in <ctype.h>.

**XSquared** · 02-09-2005

Oh, and just for reference, it is bad practice to use void main(). You should always use int main().

**cerin** · 02-09-2005

Naughty Naughty no void main.

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First Time, Please review...

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