Really Weird itoa Problem

This is a discussion on Really Weird itoa Problem within the C++ Programming forums, part of the General Programming Boards category; For my breakout clone, I need to convert the integers for the score and the level number into arrays of ...

  1. #1
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    Question Really Weird itoa Problem

    For my breakout clone, I need to convert the integers for the score and the level number into arrays of characters so I can display them on the screen with Allegro's textout function. I searched on google for a function to convert, and I found "itoa". So, it seemed to work fine. I converted "level" to "leveltex" and "score" to "scoretex" and displayed them on the screen. But then I noticed something weird was happening. Whenever "score" hit 10,000, it caused "level" to jump to 45. This happens even if there is no command telling "level" to change it's quantity in the entire program. I noticed that if I didn't convert score using itoa, "level" did not jump to 45. So, whenever "score" hits 10,000 and is converted with itoa, "level" jumps to 45. Here is the itoa part of the code:
    Code:
    void DrawHUD()
    {
    	itoa(level,leveltex,10);
    	itoa(score,scoretex,10);
    	textout(buffer,font,"Level:",700,120,makecol(255,255,255));
    	textout(buffer,font,leveltex,700,130,makecol(255,255,255));
    	textout(buffer,font,"Score:",700,90,makecol(255,255,255));
    	textout(buffer,font,"10000",700,100,makecol(255,255,255));
    }
    Nowhere in the program does it tell level to change. What's going on? Is there another part of the code I should show you guys?

  2. #2
    Sweet
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    Survey says,
    textprintf_ex or textprintf
    http://www.allegro.cc/manual/api/tex.../textprintf_ex
    Woop?

  3. #3
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    But this doesn't seem to be a problem with the output of text, just the conversion.

  4. #4
    Sweet
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    I know I was just making your life easier. Using a non-standard function is not always a good idea.
    Woop?

  5. #5
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    What do you mean non-standard? There both Allegro functions.

  6. #6
    Sweet
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    itoa is a non-standard function. Like I said my first suggestion does the fix all. Just simply do this
    Code:
    textprintf_ex(screen, font, 700, 120, makecol(255,255,255), - 1, "Score: %d", score);
    Woop?

  7. #7
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    All it did is flicker "Score: -1". OH wait, it was flickering because I didn't draw it to the buffer first.

  8. #8
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    Nevermind, It works now. Thanks! I still don't see why itoa did what it did though, but I guess it doesn't matter.

  9. #9
    and the hat of wrongness Salem's Avatar
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    > Thanks! I still don't see why itoa did what it did though, but I guess it doesn't matter.
    Oh it still matters - all that you've done is sweep the problem under the carpet for it to reappear in another place at another time. Only next time, you might not have the repeatability of this bug.

    Your description suggests a string length overflow problem. I bet if you try the same thing in a very small program - just that function and enough main() to call it, you'll either see no problem at all, or it will be obvious where you're going wrong.

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