For Loop Part 2

Let's explore some cool variations of the for loop condition

Counting Backwards:

for (int i = 10; i >= 0; i--) {
    std::cout << i << " ";
}
// Output: 10 9 8 7 6 5 4 3 2 1 0

Notice how we start with a higher number (i = 10), Use i >= 0 as our condition and use i-- to decrease the counter

Want to skip numbers? Just change the increment/decrement value:

// Counting up by 2s
for (int i = 0; i <= 10; i+=2) {
    std::cout << i << " ";
}
// Output: 0 2 4 6 8 10

// Counting down by 2s
for (int i = 10; i >= 0; i-=2) {
    std::cout << i << " ";
}
// Output: 10 8 6 4 2 0

You can even use multiple variables in your loop control:

for (int i = 0, j = 10; i <= 10; i++, j--) {
    std::cout << "i = " << i << " "  << "j = " << j << " ";
    
}
// Output: i = 0 j = 10
//         i = 1 j = 9
//         i = 2 j = 8
// And so on...

In this example, we have two counter variables, i and j, initialized to 0 and 10, respectively. In each iteration, i is incremented by 1 and j is decremented by 1. The loop continues as long as i is less than or equal to 10.