Thread: in c language , How to get 2 values in single variable and swap them ???

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    in c language , How to get 2 values in single variable and swap them ???

    In C programming , How to get 2 values in a single variable and swap them ??? Help me with some examples !! Thanks in advance

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    C++ Witch laserlight's Avatar
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    What do you mean by "get 2 values in a single variable"? A swap between two variables is easily performed with a third variable.
    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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    hello..

    By Declaring only a single variable , we must get 2 values and swap them ... i got a clue (it is possible , using storage class) !!!! plz hep

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    C++ Witch laserlight's Avatar
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    In a sense it is possible, e.g., you declare an array of two elements and swap the elements, or you declare a variable of a struct type that has two members, then you swap the members of the struct object. Otherwise it does not make sense to me as I would consider the variable as having a single value, so there is nothing to swap.
    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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    I assume the variable is an array,
    you can declare a array with subscript 3 or more,
    using first 2 to store the 2 values, and use the third one as a "temporary buffer".

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    I suppose you could logically store, for example, two 8 bit values in a 16 bit variable, then swap the bytes. However you'd need to either have two separate 8 bit variables to start with, or two pointers with each pointing to a different byte in the 16 bit variable.

    Sounds a bit convoluted.

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    ^^^^ That's what I was thinking of, and yeah, it sounds like another academic exercise.

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