import UIKit

//for index in 1..<101 {
//    print("Ok \(index)")
//}

//let start = 0
//let end = 123
//
//for index in start...end {
//    print("Ok \(index)")
//}

//var index = 0
//while index < 100 {
//    print("Ok \(index)")
//    index = index + 1
//}

var index = 0
while index < 100 {
    print("Ok \(index)")
    index = index + 2
}