Help on loops

Im trying to get this program to add the numbers to eachother after each gets executed, and 0 is suppose to terminate the program. Am I using the wrong loop? Anyone give me some tips please?

Code:

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#include <iostream>
using namespace std;
int main()
{
    cout << " Please enter a number";
    int num;
    cin >> num;
    cin.get();
    for (int i = num; i != 0; i++)
        {
            cout << " Number is now : " << i << endl;
            i += i;
            cin >> i;
            cin.get();
            };
            cout << "Terminating Program now";
            cin.get();
            return 0;
}

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Code:

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for (int i = num; i != 0; i++)

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That says starting at num:

int i = num

count upwards:

i++

until i does not equal 0:

i !=0

If you enter 3 as the number, how are you ever going to reach 0 counting upwards by 1?

This:

i += i;

is the same as multiplying 'i' by 2. Why are you multiplying your loop counter by 2? Then you read a number into your loop counter:

cin >> i;

??? Why are you abusing your loop counter like that? You aren't treating it as a loop counter, so why even have a loop counter?

You need to use a while loop. A while loop will continue executing forever until the while condition is false. So, you need to decide what condition should end the loop.

Then you need to read in a number, add it to a total, and let the loop do its thing. When the loop ends display the total.

Wont i != 0 terminate the program when the user enters a 0? What would I need to do to make it add instead of multiply? I basically want it to keep adding the numbers the user enters. Its been a while since ive programmed in c++ and forgot alot of stuff about it :(

Quote:

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Wont i != 0 terminate the program when the user enters a 0?

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I guess that's one way of looking at it. A loop counter should do one thing: count loops. It can't count loops if you are reading values into it. And, if you aren't going to use it to count loops, why have a loop counter in the first place?