How does the huge pointer work in the c language

[Belalcse]

I can not understand huge pointer, please tell me how its working.

#include<stdio.h>/ *How its working &decleration*/
int main(){
int huge *a =(int huge *)0x59990005;
int huge *b =(int huge *)0x59980015;
if(a == b)
printf("power of pointer");
else
printf("power of c");
return 0;
}

[weaknessforcats]

int huge *a =(int huge *)0x59990005;
int huge *b =(int huge *)0x59980015;

First, you have two different literals (0x59990005 and 0x59980015) which will be in two different places in memory so their addresses will never be the same.

Second, why are you trying to make these literals into an int address? Neither of these lierals is a valid address.

[Banfa]

If memory serves me huge pointers stem from 16 bit windows where huge was one of the available memory models and you needed a huge pointer to point into the extended data segment of programs using this model (this may not be exactly right because frankly it is a long time since I have thought about it).

Anyway in that memory model memory was in segments with a 16 bit address but you also had a 16 bit segment what indicated which segment of memory to use the address in.

However it is more complicated than that because the memory segments where not sequential but rather overlapped somewhat.

So my guess is that if you where actually using the huge memory model then the 2 given literals when converted to pointers would in fact reference the same address and test equal resulting in the text "power of pointer" being printed.

This is all rather academic since the huge memory model has not seen the light of day in many years, since the advent of WIN32 and a flat 32 bit virtual address space for each process.

[donbock]

Just to be clear: huge pointers are an implementation-specific extension to the language. They are not described in the C Standard. Programs that use them are not portable.

[Belalcse]

thanks for your post