Inheritance with base class constructor with parameters [duplicate]

Question

Simple code:

class foo {     private int a;     private int b;      public foo(int x, int y)     {         a = x;         b = y;     } }  class bar : foo {     private int c;     public bar(int a, int b) => c = a * b; } 

Visual Studio complains about the bar constructor:

Error CS7036 There is no argument given that corresponds to the required formal parameter x of foo.foo(int, int).

What?

Answer 1

The problem is that the base class foo has no parameterless constructor. So you must call constructor of the base class with parameters from constructor of the derived class:

public bar(int a, int b) : base(a, b) {     c = a * b; }