Page 36 - ipst-cmanual

l¤Áً Í× ¡ÒÃà¢ÂÕ ¹â»Ãá¡ÃÁÀÒÉÒ C ÊÒí ËÃºÑ ãª§Œ Ò¹¡Å͋ §ÊÁͧ¡Å IPST-MicroBOX

µÇÑ ÍÂҋ §·Õè 2-12

int a , b , c;

a = 0x7A;

b = 0x16;

c = 0xFD;

¨§ËÒ¼ÅÅѾ¸¢Í§
(1) a &= 0x3C;
(2) b |= 0x51;
(3) c ^= 0xD0;

Ç¸Ô ¤Õ ´Ô
(1) ¨Ò¡ a &= 0x3C ¡¤ç Í× a = a & 0x3C ËÁÒ¤ÇÒÁÇҋ ¹Òí ¤Ò‹ ¢Í§ a (¤Í× 0x7A) ä»á͹´¡ ºÑ
0x3C áÅnj ¼ÅÅ¾Ñ ¸· äèÕ ´¹Œ Òí ä»à¡ºç ·Õè a Í¡Õ ¤Ã§Ñé ˹§èÖ

à·ÂÕ ºä´àŒ »¹š a = (0000000001111010) & (0000000000111100)
0000000001111010
AND
0000000000111100
0000000000111000 à 0x0038 ËÃÍ× 0x38

(2) ¨Ò¡ b |= 0x51 ¡¤ç Í× b = b |= 0x51 ËÁÒ¤ÇÒÁÇҋ ¹Òí ¤Ò‹ ¢Í§ b (¤Í× 0x16) ä»ÍÍᏠºÑ
0x51 áÅnj ¼ÅÅ¾Ñ ¸· äèÕ ´¹Œ Òí ä»à¡ºç ·èÕ b Í¡Õ ¤Ã§éÑ Ë¹§Öè

à·ÂÕ ºä´àŒ »¹š b = (0000000000010110) |= (0000000001010001)
0000000000010110
OR
0000000001010001
0000000001010111 à 0x0057 ËÃÍ× 0x57

(3) ¨Ò¡ c ^= 0xD0; ¡¤ç Í× c = c ^= 0xD0 ËÁÒ¤ÇÒÁÇҋ ¹Òí ¤Ò‹ ¢Í§ c (¤Í× 0xFD) ä»àÍ¡ç ¤Å«Ù ¿Õ
ÍÍᏠºÑ 0xD0 áÅnj ¼ÅÅ¾Ñ ¸· äèÕ ´¹Œ Òí ä»à¡ºç ·Õè c Í¡Õ ¤Ã§éÑ Ë¹§Öè

à·ÂÕ ºä´àŒ »¹š c = (0000000011111101) ^= (0000000011010000)
0000000011111101
XOR
0000000011010000
0000000000101101 à 0x002D ËÃÍ× 0x2D