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Simple Programming Question

  1. Nov 27, 2011 #1
    I'm teaching myself C++ and am stuck on this VERY simple problem. I'm not sure what's wrong with my code.

    The problem is from https://projecteuler.net/ if anyone is wondering.

    1. The problem statement, all variables and given/known data
    If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.

    Find the sum of all the multiples of 3 or 5 below 1000.

    2. Relevant equations

    3. The attempt at a solution
    Code (Text):
    #include <iostream>
    using namespace std;

    int main()
    {
        int num, add;

        num = 1;
        add = 0;
        while(num < 1001)
        {
            if(num % 3 == 0 || num % 5 == 0)
            {
                add = num + add;
            }
            num = num + 1;
        }
        cout<<add<<endl;
        return 0;
    }
     
    The answer I get from this is 234168 but the site says this is wrong.
     
  2. jcsd
  3. Nov 27, 2011 #2
    Annnnd I figured out what I did wrong. The problem states below rather than up to 1000. It included 1000 in the answer so I just subtract that and be on my way.

    If there are any bad habits that are in my code, I would like to know just so I don't continue using it.

    Thanks.
     
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