Thread: What is this output?

  1. 12-12-2008 #1
    xbusterx
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    What is this output?

    a= 5 , b = 6


    a = (b++) + 3;

    c = 2*a + (++b);

    d = 2 * (++c) - (a++);


    What are the values?
  2. 12-12-2008 #2
    laserlight
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    Try to reason out the answers then put those statements into a program and see the output for yourself.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way
  3. 12-12-2008 #3
    xbusterx
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    Quote Originally Posted by laserlight View Post
    Try to reason out the answers then put those statements into a program and see the output for yourself.

    My program isn't working right now and I don't know what to do. What is the output can someone help me?
  4. 12-12-2008 #4
    laserlight
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    Quote Originally Posted by xbusterx
    My program isn't working right now and I don't know what to do.
    Fix it. What is your current program?
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way
  5. 12-12-2008 #5
    jwenting
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    Quote Originally Posted by xbusterx View Post
    My program isn't working right now and I don't know what to do. What is the output can someone help me?
    what do you think it should be?
    Tell us and we may tell you whether you're right...
  6. 12-12-2008 #6
    xbusterx
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    Quote Originally Posted by xbusterx View Post
    a= 5 , b = 6


    a = (b++) + 3;

    c = 2*a + (++b);

    d = 2 * (++c) - (a++);


    What are the values?

    a = 10, c = 27 ?, dunno what d is
  7. 12-12-2008 #7
    matsp
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    Can you produce the steps that you come to that conclusion from? [hint: I think it's wrong, I think I know WHERE you are going wrong, but it's much easier to explain what you are doing wrong if you actually show the individual steps of your calculation].

    --
    mats
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  8. 12-12-2008 #8
    EVOEx
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    Quote Originally Posted by xbusterx View Post
    a = 10, c = 27 ?, dunno what d is
    Can you tell me what you think the difference is between:
    Code:
    b++;
++b;
    Because it seems you mix those two up. I think your answers would be correct if you mix those up .
  9. 12-12-2008 #9
    Akkernight
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    Why do you declare a = 5, then later a = (b++) + 3 o.O?
    Currently research OpenGL
  10. 12-12-2008 #10
    CornedBee
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    Quote Originally Posted by Akkernight View Post
    Why do you declare a = 5, then later a = (b++) + 3 o.O?
    I don't think the input is under his control.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
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