Convertion between Delphi, VB and C/C++

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Boolean types
Delphi/Pascal	VB/Basic	C/C++	Bits	Bytes	Range
ByteBool Boolean			8	1	0=False, <>0=True (1=True is common in Delphi/Pascal)
WordBool	Boolean		16	2	0=False, <>0=True (-1=True is common in VB/Basic)
LongBool			32	4	0=False, <>0=True

Signed integer types
Delphi/Pascal	VB/Basic	C/C++	Bits	Bytes	Range
ShortInt		signed char	8	1	-128 .. 127
SmallInt	Integer	signed short signed int	16	2	-32,768 .. 32,767
Integer LongInt	Long	signed long	32	4	-2,147,483,648 .. 2,147,483,647
Int64		signed long long	64	8	–2^63 .. 2^63–1 -9,223,372,036,854,775,807 .. 9,223,372,036,854,775,807

Unsigned integer types
Delphi/Pascal	VB/Basic	C/C++	Bits	Bytes	Range
Byte	Byte	unsigned char	8	8	0 .. 255
Word		unsigned short unsigned int	16	2	0 .. 65,535
Cardinal LongWord		unsigned long	32	4	0 .. 4,294,967,295
		unsigned long long	32	4	0 .. 18,446,744,073,709,551,615

Real types
Delphi/Pascal	VB/Basic	C/C++	Bits	Bytes	Significant digits	Range
Real48			48	6	11-12	2.9 x 10^–39 .. 1.7 x 10^38
Single	Single	float	32	4	7-8	1.5 x 10^–45 .. 3.4 x 10^38
Double Real		double long double	64	8	15-16	5.0 x 10^–324 .. 1.7 x 10^308
Extended			80	10	19-20	3.6 x 10^–4,951 .. 1.1 x 10^4,932
Comp			64	8	19-20	–2^63+1 .. 2^63–1
Currency			64	8	19-20	–922,337,203,685,477.5808 .. 922,337,203,685,477.5807

Characters
Delphi/Pascal	VB/Basic	C/C++	Bits	Bytes	Range
AnsiChar Char			8	1	0 .. 255
WideChar			16	2	0 .. 65535

Strings
Delphi/Pascal	VB/Basic	C/C++	Max length	Mem. req.	Description
ShortString			255	2 .. 256 bytes	8-bit ANSI characters
AnsiString String			-2^31	4 bytes .. 2 Gbytes	8-bit ANSI characters
WideString			-2^30	4 bytes .. 2 Gbytes	Unicode characters
PAnsiChar PChar	String	Char	Zero terminated	Memory allocated	Pointer to first character in a 8-bit ANSI character string
PWideChar			Zero terminated	Memory allocated	Pointer to first character in a Unicode character string

Function declaration
Type	Delphi/Pascal	VB/Basic	C/C++
Untyped	Procedure ProcedureName;		void functionname(void)
Typed	Function FunctionName: Type;	Public Declare Function FunctionName as Type	Type functionname(void)
Untyped with parameter	Procedure ProcedureName(Value: Type);		void functionname(Type Value)
Typed with parameter	Function FunctionName(Value: Type): Type;	Public Declare Function FunctionName(Value as Type) as Type	Type functionname(Type Value)
External declaration	Function FunctionName: Type; External 'DLL name';	Public Declare Function FunctionName Lib "DLL name" as Type
Parameter seperator	; (Semicolon)	, (Comma)
Normal parameter	Value: Type	ByVal Value as Type
Constant parameter	Const Value: Type
Variable parameter	Var Value: Type	Value as Type
Untyped parameter	Var Value	Value as Any

Other stuff
	Delphi/Pascal	VB/Basic	C/C++
Type casting	Type(Value) Value As Type		Type(Value)
Value assignment	Value:=Value	Value=Value	Value=Value
Comparing values
=	Value=Value	Value=Value	Value=Value
<>	Value<>Value		Value!=Value Value<>Value
>	Value>Value		Value>Value
<	Value<Value		Value<Value
>=	Value>=Value
<=	Value<=Value

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