problem-2a.txt

2.(a)
car and plane class can be implemented the Vehicle interface
and override the corresponding methods like below:

way:-1 ------------------>>

class Car(val CarWheel:Int,val numOfPassanger:Int,val hasGas:Boolean) : Vehicle{

override fun Int set_num_of_wheels(){
return CarWheel
}
override fun Int set_num_of_passengers(){
return numOfPassanger
}
override fun Boolean has_gas(){
return hasGas
}

}

class Plane(val wheel:Int,val numOfPassanger:Int,val hasGas:Boolean) : Vehicle{

override fun Int set_num_of_wheels(){
return wheel
}
override fun Int set_num_of_passengers(){
return numOfPassanger
}
override fun Boolean has_gas(){
return hasGas
}

}

fun main(){

val car:Car=Car(4,8,true)
val plane:Plane=Plane(8,230,true)

println("Number of Passenger in car is: ${car.set_num_of-wheels()}")

}


way:2 ------------------>>

Another way of implementing the Vehicle interface is without passing values in  constructor. Using "getter" and "setter"
i.e.

[note: The naming convention of the methods of the given interface doesn't seem right.
 The method name should be "get_num_of_wheels()" instead of "set_num_of_wheels()" because its "getter" method as it has return type.
since the naming convention of the "getter" methods in the question is wrong ,so i'm also gonna name the "setter" method in wrong way in the below code.]  
]  

class Car:Vehicle{
 var wheels : Int = 0
 var numberOfPassenger : Int = 0 
 var hasGas : Boolean = false

//setter method for "wheels"
fun get_num_of_wheels(wheels:Int ){  //as I said earlier in the above "note" that, the naming convention of the "getter" methods is wrong in the given interface.so i'm also write this "setter" method name in wrong way. 
this.wheels=wheels                  // this method name should be "set_num_of_wheels()" 
}

//setter method for "passenger"
fun get_num_of_passenger(numberOfPassenger:Int){ // this method name should be "set_num_of_passenger "
this.numberOfPassenger=numberOfPassenger
}

//setter method for "gas"
fun set_has_gas(hasGas:Boolean){ 
this.hasGas=hasGas
}

//getter method for "wheels"
override fun Int set_num_of_wheels(){  // this method name should be "get_num_of_wheels()" 
return this.wheels                 
}

//getter method for "passenger"
override fun Int set_num_of_passenger(numberOfPassenger:Int){ // this method name should be "get_num_of_passenger "
this.numberOfPassenger=numberOfPassenger
}

//getter method for "gas"
override fun has_gas(hasGas:Boolean){ 
this.hasGas=hasGas
}

}



class Plane:Vehicle{
 var wheels : Int = 0
 var numberOfPassenger : Int = 0 
 var hasGas : Boolean = false

//setter method for "wheels"
fun get_num_of_wheels(wheels:Int ){  //as I said earlier in the above "note" that, the naming convention of the "getter" methods is wrong in the given interface.so i'm also write this "setter" method name in wrong way. 
this.wheels=wheels                  // this method name should be "set_num_of_wheels()" 
}

//setter method for "passenger"
fun get_num_of_passenger(numberOfPassenger:Int){ // this method name should be "set_num_of_passenger "
this.numberOfPassenger=numberOfPassenger
}

//setter method for "gas"
fun set_has_gas(hasGas:Boolean){ 
this.hasGas=hasGas
}

//getter method for "wheels"
override fun Int set_num_of_wheels(){  // this method name should be "get_num_of_wheels()" 
return this.wheels                 
}

//getter method for "passenger"
override fun Int set_num_of_passenger(numberOfPassenger:Int){ // this method name should be "get_num_of_passenger "
this.numberOfPassenger=numberOfPassenger
}

//getter method for "gas"
override fun has_gas(hasGas:Boolean){ 
this.hasGas=hasGas
}

}

fun main(){
val car:Car=Car()
car.get_num_of_passenger(8)
println(set_num_of_passenger())
}