Plus to Negative value

This is a discussion on Plus to Negative value within the C++ Programming forums, part of the General Programming Boards category; Is there any syntax that will return the opposite value of plus and negative. It should be one syntax that ...

  1. #1
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    Plus to Negative value

    Is there any syntax that will return the opposite value of plus and negative.
    It should be one syntax that take the opposite. It must work both directions.

    So for these examples:

    Code:
    5       //This will return -5
    -4     //This will return   4

  2. #2
    C++ Witch laserlight's Avatar
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    Well, if you have a number x, -x is such an opposite.
    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

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    That did work actually. So if you just write like in you example a - before x like -x.
    This will make + to - and - to +. I thought that only would work from + to -.
    Then if x is - from the beginning it must be a kind of multiplication -(-x) makes plus I beleive.
    Thanks

  4. #4
    C++ Witch laserlight's Avatar
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    Then if x is - from the beginning it must be a kind of multiplication -(-x) makes plus I beleive.
    Not multiplication, but just subtraction.
    -(-x) = 0 - (-x) = 0 - (0 - x)
    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

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    Then I think I understand. Thanks.

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