rand() to choose?

This is a discussion on rand() to choose? within the C++ Programming forums, part of the General Programming Boards category; If I have a function like select(int a, int b, int c) how can I use the rand() to select ...

  1. #1
    Registered User
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    Oct 2001
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    7

    rand() to choose?

    If I have a function like select(int a, int b, int c) how can I use the rand() to select a, b or c and then return that value? ie.. if a=30, b=40 and c=50 how can i use rand() to just pick b and return 40 back out? And then the next time i call the function, if c=45 use rand() to pick c that time and return 45?

    So, in other words, I only need rand() to randomly pick either a, b or c and then return it. I know that the faq shows how to use rand to generate an actual value but thats not what I need for this. Thanks for any help.

  2. #2
    www.entropysink.com
    Join Date
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    Generate a random number between 1 & 3, and then use a select case to select the relevant function based on the value.

    (Alternatively, use a GOTO [J/K Prelude]).
    Visit entropysink.com - It's what your PC is made for!

  3. #3
    Registered User
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    Nov 2001
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    Sone thing like this will work but to get a more random number you should really use a time seed "srand(time()0;" under the stdlib.h and time.h headers

    .code

    int select(int a, int b, int c)
    {
    int temp=rand()%3+1;
    if(temp==1)
    return a;
    if(temp==2)
    return b;
    if(temp==3)
    return c;
    }

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