C/PB Variable Types

[Inner]

I have some C types that I'm unable to find conclusive data on probably the confusion is some search results are 64bit and 32bit, if someone could fill the holes I'd be greatful.

it's obviously a sqlite table, that's intended to reference purebasic veriables.

(type, bytesize,minrange, maxrange, pbisequal)

Code: Select all

"('char',              '1 Byte', '-128','+127',              'Byte')")
"('unsigned char',     '1 Byte', '0',   '255',               'Ascii')")    
"('int',               '2 Byte', '-2147483648','+2147483647','Long')")
"('unsigned int',      '2 Byte', '0','+4294967295',          '')")    
"('short int',         '1 Byte', '-32768','+32767',          'Word')")
"('unsigned short int','?',      '0','+65535',               'Unicode')")    
"('long',              '',       '','',                      '')")
"('unsigned long',     '',       '','',                      '')")    
"('long int',          '4 Byte', '','',                      '')")
"('unsigned long int', '4 Byte', '','',                      '')")    
"('float',             '4 Byte', '','',                      'Float')")
"('double',            '8 Byte', '','',                      'Double')")
"('long double',       '10 Byte','','',                      '')")

[idle]

don't know what long double offhand most likely 16 bytes for SSE

[juergenkulow]

C data types are not unique and depend on implentation.
programiz c-data-types
Wiki Integer Common_integral_data_types
Wiki C_data_types

[Axolotl]

Old but maybe helpful:
Compiling a list of WinAPI types and their Purebasic equals

[mk-soft]

If you can't find a type size again, check with c.

Update

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; Check size with c-backend

Global size

; Window: long x86 = 4 bytes, x64 = 4 bytes
; Linux, macOS: long x86 = 4 bytes, x64 = 8 bytes

! long value;
! g_size = sizeof(value);
Debug size

; x86 = 4 bytes, x64 = 8 bytes
! int iValue;
! g_size = sizeof(iValue);
Debug size

Debug SizeOf(Integer)

[Axolotl]

Hi mk-soft,
I tried your code and did not get the result i expected:

Code: Select all

; Check size with c-backend

Global size

; x86 = 4 bytes, x64 = 8 bytes
! long value;
! g_size = sizeof(value);
Debug size	; == 4 -> not correct on x64 ?

; x86 = 4 bytes, x64 = 8 bytes
! int iValue;
! g_size = sizeof(iValue);
Debug size		; == 4 -> not correct on x64  

Debug SizeOf(Integer) 	; == 8	

[mk-soft]

A 'c' int is always 32 bit

An integer is defined for PB:
X86

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typedef long long quad;
typedef int integer;

X64

Code: Select all

typedef long long quad;
typedef quad integer;

[mk-soft]

Just tested.

Once again typical OS.

X64 Window:
c type long = 4 byte

X64 Linux, macOS
c type long = 8 byte

Therefore, the pb type Quad is always defined as long long so that it also has 8 bytes on all OSs
and pb type long is defined as c type int (32bit)

[juergenkulow]

A 'c' int is always 32 bit

Turbo C Users Guide Page 226(213)Table 8.4: Turbo C Data Types, Sizes, and Ranges
Type Size (bits) Range
unsigned char 8 0-255
char 8 -128 -127
enum 16 -32768 - 32767
unsigned short 16 0- 65535
short 16 -32768 - 32767
unsigned int 16 0- 65535
int 16 -32768 - 32767
unsigned long 32 o- 4294967295
long 32 -2147483648 - 2147483647
float 32 3.4E-38 - 3.4E+38
double 64 1.7E-308 -1.7E+308
long double 64 1.7E-308 -1.7E+308
pointer 16 (near, _cs, _ds, _es, _ss fointers)
pointer 32 (far, huge pointers

[mk-soft]

We have to start from GCC compiler and not from other c compilers

[Shardik]

Here you find a nice overview table for C data types in the German Wikipedia (at the end of the article).

[Inner]

Thanks all very informative.. however I didn't intend to start are type war lol

[idle]

I really shouldn't answer questions when I'm tired and suffering brain fog.