Quick question

This is a discussion on Quick question within the C Programming forums, part of the General Programming Boards category; Hi all, just a quick question, do you know why the code below would the give the following answers ive ...

  1. #1
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    Quick question

    Hi all,

    just a quick question, do you know why the code below would the give the following answers ive given, i understand why they input on the 4 separate lines but the amount of times it prints the letter 'x' is confusing me.

    Code:
    int i=1;
    while (i<=24)
    {
            printf("%c", i%6 ==0 ? '\n' : 'x');
            i++
    }
    Why would this give the answer: Generate 5 letters 'x' on 4 separate lines.


    Thanks.

  2. #2
    ZuK
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    Quote Originally Posted by mattio87 View Post
    Why would this give the answer: Generate 5 letters 'x' on 4 separate lines.
    Why do you expect something different ?
    Kurt

  3. #3
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    Yes, i would have thought it would have printed 4 x's not five.

  4. #4
    ZuK
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    Code:
    1 % 6 = 1 -> 'x'
    2 % 6 = 2 -> 'x'
    3 % 6 = 3 -> 'x'
    4 % 6 = 4 -> 'x'
    5 % 6 = 5 -> 'x'
    6 % 6 = 0 -> '\n'
    7 % 6 = 1 -> 'x'
    ....
    Kurt

  5. #5
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    I still dont understand it Kurt, it says i=1 i<=24, so it uses 1 -> 24.

    24/6 = 4, giving the amount of separate lines.

    I have no idea where the 5 letters of X still come from though

  6. #6
    ZuK
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    I hope that we agree that your code prints a total of 24 chars.
    24/6 = 4 '\n' and 20 'x'
    Kurt

  7. #7
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    If so, why does the answer say that it prints 5 letters 'x'?

    Am i just being stupid? lol

  8. #8
    ZuK
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    If the answer says that it prints only 5 x's then the answer is wrong.
    It prints 4 times 5 x's.
    Kurt

  9. #9
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    Well, as you can see in Kurt's post, all the values between two different multiples of 6 print an x. So you can do the following to find how many 'x' are printed between two consecutive multiples:

    ((k+1) * 6) - ((k * 6) + 1) = 5

    k*6 is a multiple of 6 and will result in a linebreak.
    k*6 + 1 is the first character that will result in an x being printed
    (k+1)*6 is the next multiple of 6

    The difference of the two clearly results in 5.

    And yes, the output is:

    Code:
    xxxxx
    xxxxx
    xxxxx
    xxxxx

  10. #10
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    Thanks very much, i understand it now.

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