Var
Declares a variable whose type is implied from the initializer expression
Var declares a variable whose type is implied from the initializer expression. It is illegal to specify an explicit type in a Var declaration. The initializer expression does not have to be a constant, it can be, or, it can be any variable of any type. Note: WString is not supported with Var, due to the fact that there is no var-len WString type. This isn't likely to change, due to the complexities involved with handling Unicode.
Since the type of the variable is inferred from what you assign into it, it's helpful to know how literals work. Any literal number without a decimal point defaults to Integer. A literal number with a decimal point defaults to Double.
All ZString expressions, including string literals and dereferenced ZString Ptrs, will be given the String variable type.
Explicit suffixes may be used on literal variables, to change/clarify their type. See Literals and Variable Types for some more information about suffixes that can be used on literals.
Note: Suffixes must appear on the initializer, not on the variable. Trying to use Var with a variable that has a suffix will throw a compile error.
Syntax
Description
Var declares a variable whose type is implied from the initializer expression. It is illegal to specify an explicit type in a Var declaration. The initializer expression does not have to be a constant, it can be, or, it can be any variable of any type. Note: WString is not supported with Var, due to the fact that there is no var-len WString type. This isn't likely to change, due to the complexities involved with handling Unicode.
Since the type of the variable is inferred from what you assign into it, it's helpful to know how literals work. Any literal number without a decimal point defaults to Integer. A literal number with a decimal point defaults to Double.
All ZString expressions, including string literals and dereferenced ZString Ptrs, will be given the String variable type.
Explicit suffixes may be used on literal variables, to change/clarify their type. See Literals and Variable Types for some more information about suffixes that can be used on literals.
Note: Suffixes must appear on the initializer, not on the variable. Trying to use Var with a variable that has a suffix will throw a compile error.
Example
Var a = Cast(Byte, 0)
Var b = Cast(Short, 0)
Var c = Cast(Integer, 0)
Var d = Cast(LongInt, 0)
Var au = Cast(UByte, 0)
Var bu = Cast(UShort, 0)
Var cu = Cast(UInteger, 0)
Var du = Cast(ULongInt, 0)
Var e = Cast(Single, 0.0)
Var f = Cast(Double, 0.0)
Var g = @c '' integer ptr
Var h = @a '' byte ptr
Var s2 = "hello" '' var-len string
Var ii = 6728 '' implicit integer
Var id = 6728.0 '' implicit double
Print "Byte: ";Len(a)
Print "Short: ";Len(b)
Print "Integer: ";Len(c)
Print "Longint: ";Len(d)
Print "UByte: ";Len(au)
Print "UShort: ";Len(bu)
Print "UInteger: ";Len(cu)
Print "ULongint: ";Len(du)
Print "Single: ";Len(e)
Print "Double: ";Len(f)
Print "Integer Pointer: ";Len(g)
Print "Byte Pointer: ";Len(h)
Print "Variable String: ";Len(s2)
Print
Print "Integer: ";Len(ii)
Print "Double: ";Len(id)
Sleep
Var b = Cast(Short, 0)
Var c = Cast(Integer, 0)
Var d = Cast(LongInt, 0)
Var au = Cast(UByte, 0)
Var bu = Cast(UShort, 0)
Var cu = Cast(UInteger, 0)
Var du = Cast(ULongInt, 0)
Var e = Cast(Single, 0.0)
Var f = Cast(Double, 0.0)
Var g = @c '' integer ptr
Var h = @a '' byte ptr
Var s2 = "hello" '' var-len string
Var ii = 6728 '' implicit integer
Var id = 6728.0 '' implicit double
Print "Byte: ";Len(a)
Print "Short: ";Len(b)
Print "Integer: ";Len(c)
Print "Longint: ";Len(d)
Print "UByte: ";Len(au)
Print "UShort: ";Len(bu)
Print "UInteger: ";Len(cu)
Print "ULongint: ";Len(du)
Print "Single: ";Len(e)
Print "Double: ";Len(f)
Print "Integer Pointer: ";Len(g)
Print "Byte Pointer: ";Len(h)
Print "Variable String: ";Len(s2)
Print "Integer: ";Len(ii)
Print "Double: ";Len(id)
Sleep
Differences from QB
- New to FreeBASIC 0.17
Dialect Differences
- Not available in the -lang qb dialect unless referenced with the alias __Var.
See also
