Why this err is occurring? And how to solve it?

Question

fun man(a:Int):Int{
if(a>3){
return a
}
}
fun main(args: Array<String>) {
print(man(6))
}

Answer 1

If a is not greater than 3 the function does not return a value, but the return type says Int.

You need an else part that returns some default value, or make the return type nullable and return null.

Answer 2

fun man(a:Int):Int{
if(a>3) return a
return 0 // A 'return' expression required in a function with a block body
}

fun main(args: Array<String>) {
print(man(6))
}