What's really going on?

[tunkthefunk]

Hey there,
I just completed problem 1 of projecteuler.net, however as I was working with my code I noticed something odd, which I would love to have explained. If I do not initialize the variable 'result' to a value and run the code, I get result = 1606655790. I realize the problem is line 12, where I have result += i. Since result is not initialized its working off an empty value (?) of itself. I was actually surprised that a number is even spit out, and wanted to know what the computer is doing to arrive at the incorrect solution given above? Another question as well, when I have not set a variable to a value, what does it represent in the computer? Hope I made all of that clear. Thanks!

  #include <iostream>
using namespace std;

int main()

{
    int result = 0;
    for (int i = 1; i < 1000; i++)
    {
        if (((i % 3) == 0) || ((i % 5) == 0))
        {
            result += i;
        
    }
    
    }
    cout << "The sum of the multiples of 3 and 5 below 1000 is " << result << "\n";
}

[wildblue]

Uninitialized variables contain some random garbage value, not an empty value, whatever is in the memory location that has been allocated for your variable.

[jlb]

Well first the computer is not arriving a an incorrect solution, the solution is correct, what ever it is.

You have invoked undefined behavior because you didn't properly initialize a variable before you used it. An uninitialized variable can have any value, usually some random leftover value.

[tunkthefunk]

Well the solution is incorrect relative to the problem I'm trying to solve, when the variable is left unitialized, but I get what you're saying.

That's interesting however, where could I go to learn more about memory allocation, locations, and similar things?

Thanks