FunctionDemo.kt

/**
 * firstParam is of the type Integer which is called Int
 * secondParam is of the type Int
 * The last Int after colon and before the opening bracket of method is the return type, which is Int in our case
 */
fun multiply(firstParam : Int, secondParam : Int): Int {
    return firstParam * secondParam
}

/**
 * This function is same as above except that we do not have
 * to explicitly declare the return type
 */
fun multiplyWithInferredReturnType(firstParam : Int, secondParam : Int) = firstParam * secondParam

/**
 * This function is same as above except that we have explicitly mentioned return type as Unit
 * which means none.
 */
fun multiplyWithUnitReturnType(firstParam : Int, secondParam : Int) : Unit {
    println("${firstParam * secondParam}")
}

/**
 * This function is same as above except that we have not explicitly mentioned return type as Unit
 * which means none.
 */
fun multiplyWithNoReturnType(firstParam : Int, secondParam : Int) {
    println("${firstParam * secondParam}")
}



fun main() {
    println(multiply(10, 10))
    println(multiplyWithInferredReturnType(13,10))
    multiplyWithUnitReturnType(9,7)
    multiplyWithNoReturnType(11,9)
}