Thread: Weird bug ?

  1. #1
    Registered User
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    Weird bug ?

    I made a progam to calculate the surface of a cirkel. But when i open it, and a give the dia meter and press enter, the progam close. This is the code;
    Code:
    #include <stdio.h>
    #define PI 3.14
    int main()
    {
    int diameter;
    double straal;
    double oppervlakte;
    
    printf("Geef de diameter van de cirkel:\t");
    scanf("&#37;d", &diameter);
    
    straal = diameter / 2;
    oppervlakte = PI * (straal * straal);
    
    printf(" De oppervlakte is \t%d", oppervlakte);
    return 0;
    }
    (don't look at the dutch words)
    Do you know a solution?

  2. #2
    Hurry Slowly vart's Avatar
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    1. diameter / 2 uses integer division - I don't think you want it
    2. printf(" De oppervlakte is \t&#37;d", oppervlakte);

    oppervlakte is double - suitable format for printf is %f

    3. See the FAQ why the Window of the program will close on exit and how to prevent it - for example run it from the command prompt
    All problems in computer science can be solved by another level of indirection,
    except for the problem of too many layers of indirection.
    David J. Wheeler

  3. #3
    Woof, woof! zacs7's Avatar
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    A little bit of indenting wouldn't hurt either

  4. #4
    Frequently Quite Prolix dwks's Avatar
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    Surely you can find a more accurate value for pi. From memory, pi is 3.14159265358979. Even typing "pi" into google gives you 3.14159265.

    And if you want lots of digits, go here: http://3.141592653589793238462643383...974944592.com/

    Note that over fifteen or twenty digits is overkill because that's what a double is accurate to.
    dwk

    Seek and ye shall find. quaere et invenies.

    "Simplicity does not precede complexity, but follows it." -- Alan Perlis
    "Testing can only prove the presence of bugs, not their absence." -- Edsger Dijkstra
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