JuniorTheoryCommon

What does the program print (lines separated by spaces)?

KOTLIN

fun check(): Boolean {
    println("check")
    return true
}

fun main() {
    val ok = false && check()
    println(ok)
}

false

Expecting check before false: && stops as soon as its left side is false, because the result can no longer become true, so check() is never called.
Expecting true because check() returns true: && gives true only when both sides are true, and one false makes the whole result false.

JuniorTheoryCommon

KOTLIN

fun check(): Boolean {
    println("check")
    return true
}

fun main() {
    val ok = false && check()
    println(ok)
}

false

Expecting check before false: && stops as soon as its left side is false, because the result can no longer become true, so check() is never called.
Expecting true because check() returns true: && gives true only when both sides are true, and one false makes the whole result false.