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char and c-string not playing nice

 
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char and c-string not playing nice, trying to get length and isdigit
ddollar
2 Feb, 2008 - 10:56 PM
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Entry should be one key-stroke and not a digit. I tried Char but couldn't get the length, so I changed it; now i'm having problem counting keystrokes. How do I do both? The call to tooMany works great although I didn't show it here. Any attempt I make at isdigit, is not. It's a char.

If I change char grade[3] to char grade, I can use isdigit but can't get the length with strlen. I'm just stuck.

Here I tried to use atoi to change the char to an int but that didn't work either.

CODE

int main()
{
        char grade[3];
        char letter;
        // Collect first entry.
        cout << "What is your first letter grade? ";
        cin.get (grade,3);

        letter = (atoi(grade));
                cout << letter;

        if (!tooMany(strlen(grade)))

        cout << "\nnext part";

        cout << endl;
        cout << "Press any key to quit...";
        getch();

        return 0;
}
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jjhaag
RE: Char And C-string Not Playing Nice
2 Feb, 2008 - 11:22 PM
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You can still use isdigit, but you will have to apply it element-by-element in a loop.

If you just need the first character entered, however, you can still store the input in a char, and then use cin.ignore() to toss all of the characters remaining in the stream.
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WXY
RE: Char And C-string Not Playing Nice
2 Feb, 2008 - 11:26 PM
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If I remember right, strlen requires the zero byte terminator in your string, however basic_istream::get() don't append one to your buffer, which could be why strlen is failing or producing unexpected results.
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jjhaag
RE: Char And C-string Not Playing Nice
2 Feb, 2008 - 11:59 PM
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The get method does append a null terminator, at least according to the docs at cplusplus.com and msdn. I think that the problem with strlen() that ddollar was describing was the inability to use strlen with a single character (rather than an array), to test how many characters were entered by the user of the program.
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