AmiWest Lesson 2

AmiWest Lesson 2: Fundamentals

Basic Types

It is important to under at least the basic types when programming. The following table summarizes the basic types used in AmigaOS as compared to standard C and C++ types:

AmigaOS Types

Type	Deprecated Type(s)	C	C++
uint64	none	uint64_t	uint64_t
int64	none	int64_t	int64_t
uint32	ULONG or LONGBITS or CPTR	uint32_t	uint32_t
int32	LONG	int32_t	int32_t
uint16	UWORD or WORDBITS or USHORT or UCOUNT or RPTR	uint16_t	uint16_t
int16	WORD or SHORT or COUNT	int16_t	int16_t
uint8	UBYTE or BYTEBITS	char or unsigned char	unsigned char
int8	BYTE	signed char	signed char
STRPTR	none	char*	char*
CONST STRPTR	n/a	char* const x	char* const x
CONST_STRPTR	n/a	const char*	const char*
CONST CONST_STRPTR	n/a	const char* const	const char* const
APTR	none	void*	void*
CONST APTR	none	void* const x	void* const x
CONST_APTR	none	const void*	const void*
CONST CONST_APTR	none	const void* const	const void* const
float32	FLOAT	float	float
float64	DOUBLE	double	double
BOOL	none	int16	int16
TEXT	none	char	char
NULL	none	0L	(void*)0L
BPTR	none	int32_t	int32_t
BSTR	none	int32_t	int32_t
ZERO	none	(BPTR)0	(BPTR)0

Static versus Dynamic Linking

Here is hello world done with static linking:

#include <stdio.h>
 
int main()
{
 printf("Hello, world\n");
 return 0;
}

gcc -mcrt=clib2 -o hello hello.c

Tasks and Processes

Code to display Tasks and Processes.