Thread: About arrays

  1. #1
    Registered User
    Join Date
    Sep 2004

    About arrays

    Hello. A bit stupid question but sorry... I haven`t got much time to slove it. So... is there ant way to check is a value in array for example: if(a in b[]) {...} something like this...? THNX C ya
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  2. #2
    the hat of redundancy hat nvoigt's Avatar
    Join Date
    Aug 2001
    Hannover, Germany
    There is no built in functionality. You can either write a function yourself using a simple for loop or you can check <algorithm> for a searching algorithm. Maybe there is one. However, if you have just an array of ints in the magnitude of 100 to 200 numbers or less, don't waste your energy and just use a small loop.

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  3. #3
    Registered User hk_mp5kpdw's Avatar
    Join Date
    Jan 2002
    Northern Virginia/Washington DC Metropolitan Area
    The <algorithm> header mentioned by nvoigt contains the find function that can be used with arrays as such:

    #include <iostream>
    #include <algorithm>
    int main()
        int array[10] = { 5, 8, 10, 12, 20, 16, 13, 15, 17, 4 };
        int *ptr;
        // Find the value 11
        ptr = std::find(array,array+10,11);
        if( ptr != array+10 )
            std::cout << "Found 11." << std::endl;
        else std::cout << "Could not find 11." << std::endl;
        // Find the value 12
        ptr = std::find(array,array+10,12);
        if( ptr != array+10 )
            std::cout << "Found 12." << std::endl;
        else std::cout << "Could not find 12." << std::endl;
        return 0;
    Should output:
    Could not find 11.
    Found 12.
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