kotlin-small-tasks

--------- Tasks for if ---------



//1. just general

one girl has a mother, a father, a sister and a brother.

each person has sex and two parents.

how many ifs should we use to find out relationship between the girl and her random relative?

answer: 3
example:
if (me.F = he.F)
	if (he.male) "brother"
	else "sister"
else if (me.F = he) "father"
else "mother"

(may be expanded to other relatives, like granny, aunt and so on... It becomes much more interesting then)


//2. Theory about braces
Choose all that apply.

when we want to return the if result as an expression, we must omit curly braces. (-)

when we want to use if without else branch we must include curly braces. (-)

we must use curly braces if we have several statements inside if or else branch. (+)

when we use if not as an expression we must include curly braces. (-)

we can't omit round brackets around boolean condition if we use if as an expression (+)


//3. More theory:
Choose all that apply.

the if-else-if branch can omit else branch. (+)

we can use if-else-if-else branch as an expression (+)

we can not nest non expressional style ifs inside expressional style one (-)

all expression style if branches must return the same type.  (-)

expression style if must have else branch (+)

//4. some code exapmle

What will be the result of this code

println(if (if (false) true else false) if (true) { true } else false)

true(+)
false(-)
It won't compile because of the first if(+)
It won't compile because of the second if(-)
It won't compile because of the third if(-)