fn main() {
    let mut sum = 0
    for i in 0..10 {
        sum += i
    }
    println("Sum: " + sum)

    let mut fact = 1
    for i in 1..11 {
        fact *= i
    }
    println("Fact: " + fact)

    let mut power = 1
    for i in 0..20 {
        power *= 2
    }
    println("Power: " + power)

    let mut count = 5
    while count > 0 {
        println("T-" + count)
        count -= 1
    }
    println("Launch!")
}
