Absurd Math?!!

This is a discussion on Absurd Math?!! within the C Programming forums, part of the General Programming Boards category; Hello, It's has been a long time since my last post here (just saying). Anyway, here's my code: Code: double ...

  1. #1
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    Absurd Math?!!

    Hello,
    It's has been a long time since my last post here (just saying).
    Anyway, here's my code:
    Code:
    double i;
    for(i = 0;i<1;i=i+0.1){
    if(i*2 == 1.6)printf("%s\n", "Found the Number");
    }
    If could spare a few minutes for me, and run the program, you'll notice, that the message doesn’t appear(even though 0.8, as you know, is the answer, and the 'for' loop definitely covers that number).
    Any suggestions?
    Thank you very much for your attention,
    Thanks,
    Daniel
    P.S
    I've tried the code in Java, Qbasic, and it's working perfectly on them...
    Last edited by danielakkerman; 01-09-2007 at 11:42 AM.

  2. #2
    Registered User ssharish2005's Avatar
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    Code:
    for(i = 0;i<1i+i0.1){
    Your program should give a error message
    Code:
    for(i = 0;i<1;i+=0.1)
    Look u should compare the float with the == operator. search the form. And why this way

    Code:
    printf("%s\n", "Found the Number");
    could me

    Code:
    printf("Found the Number\n");


    ssharish2005
    Last edited by ssharish2005; 01-09-2007 at 11:48 AM.

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    Didn't quite get that...

    Could you correct the code please?
    Thanks,
    Daniel

  4. #4
    Registered User ssharish2005's Avatar
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    Code:
    for(i=0; i<1; i += 0.1)
        {
            if(fabs(i*2- 1.6) < 0.00001)
                    printf("Found the Number\n");
        }
    ssharish2005

  5. #5
    CSharpener vart's Avatar
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    you can search the forum, this was discussed many times... for example
    Floating Values acting weird.
    The first 90% of a project takes 90% of the time,
    the last 10% takes the other 90% of the time.

  6. #6
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    Working! XD Thanks :D!!!

    Thank you very much again, it's working.
    Thanks,
    Daniel

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