can not be applied for string and void

Question

Hi

I ger the error :"can not be applied for string and void". Any way to fix it?

auto.Horn() works, but i want it into Console.WriteLine.

Thanks

using System;
class Vehicle
{
public virtual void Horn()
{
Console.WriteLine("horn in general");
}
}

class Car : Vehicle
{
public override void Horn()
{
Console.WriteLine("horn of car does tuut!");
}
}

class Head
{
static void Main(string[] args)
{
Car auto = new Car();
Console.WriteLine("Horn does " + auto.Horn());
}
}

Sachin Singh · Answer

you unknowingly doing a strange mistake, you are doing writeline inside writeline , which is not acceptable. your Horn() methods don't return something it just writes so you can't call it inside writeline. do this instead. Note:- The key point is a string can only be concatenated with a string, but Horn() method returns a void. also, the void can not be concatenated with any datatype as void means just nothing. class Head { static void Main(string[] args) { Car auto = new Car(); Console.Write( "Horn does:" ); auto.Horn(); } }

Pranam Bhat · Answer

Correct : public class Car : Vehicle

Sonil Kumar · Answer

@ Valerie Meunier - With this, I get the error: "base class is less accessible than class 'Car'. You are getting this error because your base class has less accessibility than the child class. A parent always has had the same or greater accessibility than a child. Because, if your child is public and parent class is internal or less accessible, your child will not be able to call the parent from outside the assembly scope. Because as per the constructor calling sequence class always call its parent constructor first. And if your parent is not available outside the assembly (or the scope) it will not able to call that. So the compiler is intelligent enough to stop that at compile time.

Valerie Meunier · Answer

Yes, i didn't see it. Stupid. Thanks

Pranam Bhat · Answer

You need to make everything to "public" class.

Valerie Meunier · Answer

Thanks for replying, but do you mean: public class Car : Vehicle { public override void Horn() { Console.WriteLine("horn of car does tuut!"); } } With this, i get the error: "base class is less accessible than class 'Car'