Cant figure out how to do this!

Im not too good at C++, plus, I am not good at anything. Anyways, I am trying to make a prog that takes a number from the user and then adds all the numbers that lead up to it together. For example

cin>>5 (num)

This is the part I dont know how to do. I know i have to use a loop, and I know how to make it count up to the number, but how do i get it to take the number it gets and put it in some kind of queue that will be added up later (0+1+2+3+4+5)?

cout<<15 (sum)

any help would be great.

If all you're doing is adding all of the numbers before the number entered then you can easily do this with a simple loop.

Code:

---

int total;
for ( int i = 0; i < num; i++ ) {
    total += i;
}
cout << total;

---

Code:

---

#include<iostream.h>
int main()
{

        int num;
        int sum = 0;

        cout << "Enter a number: ";
        cin >> num;
        while(num > 0)
        {
                sum += num;
                --num;
        }
        cout << "Sum is: " << sum << endl;

        return 0;
}

---

This can be made into a function. Here is one solution.

ok, i understand now, i didnt know about that += what is that?

total += i

is the same as

total = total + i

It's just one of those short-hand things that makes life easier. You can use that "trick" for any normal operator, like:

total -= i; (total = total - i; )
total *=i; (total = total * i; )
total /=i; (total = total / i; )

ahh, i see