how to use while loop in kotlin code example

Example 1: kotlin while

var i = 1
while (i < 5) { 	// while loop
	println(i)
	i++
}					

var i = 1
do { 				// do-while loop
	println(i)
	i++
} while (i < 5)

Example 2: kotlin while loop

while ( isTrue() );

while ( isTrue() ) {
  println("while!")
}

do {
  println("do while!")
} while (isTrue())