What is the default boolean value in C#?

Question

A boolean (bool) can't be null. And:

bool foo; if(foo){} // Use of unassigned local variable 'foo' 

Why the default value is not false? So what is the value if it is not null? What is the reason?

Edit 1 - The default value is indeed false - but all variable should be initialized, why? this is for another question ;)

Edit 2 - with Resharper : private bool foo = false; // Initializing field by default value is redundant ???

Answer 1

http://msdn.microsoft.com/en-us/library/83fhsxwc.aspx

Remember that using uninitialized variables in C# is not allowed.

With

bool foo = new bool(); 

foo will have the default value.

Boolean default is false

Answer 2

Basically local variables aren't automatically initialized. Hence using them without initializing would result in an exception.

Only the following variables are automatically initialized to their default values:

• Static variables
• Instance variables of class and struct instances
• Array elements

The default values are as follows (assigned in default constructor of a class):

• The default value of a variable of reference type is null.
• For integer types, the default value is 0
• For char, the default value is `\u0000'
• For float, the default value is 0.0f
• For double, the default value is 0.0d
• For decimal, the default value is 0.0m
• For bool, the default value is false
• For an enum type, the default value is 0
• For a struct type, the default value is obtained by setting all value type fields to their default values

As far as later parts of your question are conerned:

• The reason why all variables which are not automatically initialized to default values should be initialized is a restriction imposed by compiler.
• private bool foo = false; This is indeed redundant since this is an instance variable of a class. Hence this would be initialized to false in the default constructor. Hence no need to set this to false yourself.