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getting bytes from an integer

General and Gameplay Programming Programming

Started by Arch_Spider November 11, 2001 01:16 PM

1 comment, last by Arch_Spider 22 years, 5 months ago

Arch_Spider

122

Author

November 11, 2001 01:16 PM

hi there, If possible, how do I get the bytes from an integer with only using bit shifts and the binary operators. Thanks!

Diodor

517

November 11, 2001 01:28 PM

My favorite way of getting bytes from an integer is to let the compiler do it:

  typedef struct{unsigned char b[4];} b4_t;...int i = 15311, j;b4_t* pb4 = (b4_t*)&ifor (j=0 ; j<4 ; j++){printf ("byte %d = %d", j, (int)pb4->b[j]);}

Hope it works, I didn''t actually compile this.

diogames.com

alexmoura

450

November 11, 2001 02:35 PM

another non compiled and sure to fail approach, using only shifts and binary operations (the idea should work, though):

int i;
byte b1,b2,b3,b4;

b1 = (byte)(i&0xFF000000)>>24;
b2 = (byte)(i&0x00FF0000)>>16;
b3 = (byte)(i&0x0000FF00)>>8;
b4 = (byte)(i&0x000000FF);

You know, I never wanted to be a programmer...

Alexandre Moura