Careeroza

while and do-while

while

Example

while repeats as long as the condition is true. It checks the condition before each run, so the body may run zero times.

fun main() {
    var balance = 1000
    var month = 0
    while (balance < 1500) {
        balance += balance / 10     // 10% growth
        month++
    }
    println("Reached ₹$balance after $month months")
}

Output

Reached ₹1610 after 5 months

do-while

Example

do-while checks the condition after the body, so the body always runs at least once. Useful for retries.

fun main() {
    var attempt = 0
    val successOn = 3
    do {
        attempt++
        println("Connecting... attempt $attempt")
    } while (attempt < successOn)
    println("Connected")

    var x = 100
    do {
        println("Runs once even though x > 10: $x")
    } while (x < 10)
}

Output

Connecting... attempt 1
Connecting... attempt 2
Connecting... attempt 3
Connected
Runs once even though x > 10: 100