The foundation is the top priority ~ Initial Value of Value Type

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We need to clarify the initial values of some value types, that is, when you declare a variable, it actually has a default value.

Msdn: http://msdn.microsoft.com/zh-cn/library/83fhsxwc.aspx

 

Value Type	Default Value
Bool	False
Byte	0
Char	'\ 0'
Decimal	0.0 m
Double	0.0d
Enum	Value generated by expression (e) 0, where E is the enum identifier.
Float	0.0f
Int	0
Long	0l
Sbyte	0
Short	0
Struct	Set all value type fields to default values and all reference type fieldsNullValue.
Uint	0
Ulong	0
Ushort	0

The following table shows the integer size and range. These types constitute a subset of simple types.

Type	Range	Size
Sbyte	-128 to 127	Signed 8-digit integer
Byte	0 to 255	Unsigned 8-digit integer
Char	U + 0000 to U + FFFF	16-bit Unicode characters
Short	-32,768 to 32,767	Signed 16-digit integer
Ushort	0 to 65,535	Unsigned 16-digit integer
Int	-2,147,483,648 to 2,147,483,647	Signed 32-bit integer
Uint	0 to 4,294,967,295	Unsigned 32-bit integer
long	-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807	signed 64 integer
Ulong	0 to 18,446,744,073,709,551,615	Unsigned 64-bit integer

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