Problem with for loop exercise

[egg management fee]

I'm trying to work through some exercises on for loops and I'm stuck on this one:

Write a program that takes two integers (one lower and one higher) and report the sum of all integers in between, including the two integers. For example, if 2 and 9 are entered the sum of all the integers is 44.

\\Getting the numbers - easy enough

cout << "Enter a number from 1 - 10: " << endl;
int small;
cin >> small;

cout << "\nEnter a number from 10 - 20: " << endl;
int big;
cin >> big;

So now I have these two numbers, and I'm not sure what the best way to do the rest is.

I tried doing this:

int sum = 0;

for (i = small; i == big; i++)
    sum = sum + i;

but I got an error that said "i is not declared in this scope. If someone could point me in the right direction or get me a beer I would appreciate it.

[LN7oGNh0]

EDIT: Forget what I said, go here: http://www.learncpp.com/cpp-tutorial/57-for-statements/

[egg management fee]

(insert expletive here) !!!! I should have written:

int sum = 0;

for (int i = small; i <= big; i++)
    sum += i;

Thanks for your help!

[LN7oGNh0]

no prob.