摘要：
源：http://hi.baidu.com/skystalker/item/e7679cd79c6f751220e250c1?qq-pf-to=pcqq.c2c在C语言中有十进制,十六进制,八进制;没有二进制的定义,在C51中使用十六进制表示有时不太直观,下面介绍几种方法表示二进制[均来自网络]方法一#define_BIN(a,b,c,d,e,f,g,h)((a˂˂7)+(b˂˂6)+(c˂˂5)
源：http://hi.baidu.com/skystalker/item/e7679cd79c6f751220e250c1?qq-pf-to=pcqq.c2c
在C语言中有十进制,十六进制,八进制;没有二进制的定义,在C51中使用十六进制表示有时不太直观,下面介绍几种方法表示二进制[均来自网络]
方法一
#define _BIN(a,b,c,d,e,f,g,h) ((a<<7)+(b<<6)+(c<<5)+(d<<4)+(e<<3)+(f<<2)+(g<<1)+(h<<0)) #define _bin _BIN //_bin,_BIN均可 Example: i = _bin(1,1,1,1, 0,0,0,0); //i=0xF0 i = _bin(1,0,1,0, 1,0,0,1); //i=0xA9
方法二
#define LongToBin(n) (((n>>21)&0x80)|((n>>18)&0x40)|((n>>15)&0x20)|((n>>12)&0x10)|((n>>9) & 0x08)|((n>>6)&0x04)|((n>>3)&0x02)|((n)&0x01)) #define bin(n) LongToBin(0x##n##l) 在实际应用中：比如要用置P1为0x0f 可以这样写：P1=bin(00001111);//then P1=0X0f
方法三
/*------------binary.h----------------*/ #define B00000000 0x00 #define B00000001 0x01 #define B00000010 0x02 #define B00000011 0x03 #define B00000100 0x04 #define B00000101 0x05 #define B00000110 0x06 #define B00000111 0x07 #define B00001000 0x08 #define B00001001 0x09 #define B00001010 0x0A #define B00001011 0x0B #define B00001100 0x0C #define B00001101 0x0D #define B00001110 0x0E #define B00001111 0x0F #define B00010000 0x10 #define B00010001 0x11 #define B00010010 0x12 #define B00010011 0x13 #define B00010100 0x14 #define B00010101 0x15 #define B00010110 0x16 #define B00010111 0x17 #define B00011000 0x18 #define B00011001 0x19 #define B00011010 0x1A #define B00011011 0x1B #define B00011100 0x1C #define B00011101 0x1D #define B00011110 0x1E #define B00011111 0x1F #define B00100000 0x20 #define B00100001 0x21 #define B00100010 0x22 #define B00100011 0x23 #define B00100100 0x24 #define B00100101 0x25 #define B00100110 0x26 #define B00100111 0x27 #define B00101000 0x28 #define B00101001 0x29 #define B00101010 0x2A #define B00101011 0x2B #define B00101100 0x2C #define B00101101 0x2D #define B00101110 0x2E #define B00101111 0x2F #define B00110000 0x30 #define B00110001 0x31 #define B00110010 0x32 #define B00110011 0x33 #define B00110100 0x34 #define B00110101 0x35 #define B00110110 0x36 #define B00110111 0x37 #define B00111000 0x38 #define B00111001 0x39 #define B00111010 0x3A #define B00111011 0x3B #define B00111100 0x3C #define B00111101 0x3D #define B00111110 0x3E #define B00111111 0x3F #define B01000000 0x40 #define B01000001 0x41 #define B01000010 0x42 #define B01000011 0x43 #define B01000100 0x44 #define B01000101 0x45 #define B01000110 0x46 #define B01000111 0x47 #define B01001000 0x48 #define B01001001 0x49 #define B01001010 0x4A #define B01001011 0x4B #define B01001100 0x4C #define B01001101 0x4D #define B01001110 0x4E #define B01001111 0x4F #define B01010000 0x50 #define B01010001 0x51 #define B01010010 0x52 #define B01010011 0x53 #define B01010100 0x54 #define B01010101 0x55 #define B01010110 0x56 #define B01010111 0x57 #define B01011000 0x58 #define B01011001 0x59 #define B01011010 0x5A #define B01011011 0x5B #define B01011100 0x5C #define B01011101 0x5D #define B01011110 0x5E #define B01011111 0x5F #define B01100000 0x60 #define B01100001 0x61 #define B01100010 0x62 #define B01100011 0x63 #define B01100100 0x64 #define B01100101 0x65 #define B01100110 0x66 #define B01100111 0x67 #define B01101000 0x68 #define B01101001 0x69 #define B01101010 0x6A #define B01101011 0x6B #define B01101100 0x6C #define B01101101 0x6D #define B01101110 0x6E #define B01101111 0x6F #define B01110000 0x70 #define B01110001 0x71 #define B01110010 0x72 #define B01110011 0x73 #define B01110100 0x74 #define B01110101 0x75 #define B01110110 0x76 #define B01110111 0x77 #define B01111000 0x78 #define B01111001 0x79 #define B01111010 0x7A #define B01111011 0x7B #define B01111100 0x7C #define B01111101 0x7D #define B01111110 0x7E #define B01111111 0x7F #define B10000000 0x80 #define B10000001 0x81 #define B10000010 0x82 #define B10000011 0x83 #define B10000100 0x84 #define B10000101 0x85 #define B10000110 0x86 #define B10000111 0x87 #define B10001000 0x88 #define B10001001 0x89 #define B10001010 0x8A #define B10001011 0x8B #define B10001100 0x8C #define B10001101 0x8D #define B10001110 0x8E #define B10001111 0x8F #define B10010000 0x90 #define B10010001 0x91 #define B10010010 0x92 #define B10010011 0x93 #define B10010100 0x94 #define B10010101 0x95 #define B10010110 0x96 #define B10010111 0x97 #define B10011000 0x98 #define B10011001 0x99 #define B10011010 0x9A #define B10011011 0x9B #define B10011100 0x9C #define B10011101 0x9D #define B10011110 0x9E #define B10011111 0x9F #define B10100000 0xA0 #define B10100001 0xA1 #define B10100010 0xA2 #define B10100011 0xA3 #define B10100100 0xA4 #define B10100101 0xA5 #define B10100110 0xA6 #define B10100111 0xA7 #define B10101000 0xA8 #define B10101001 0xA9 #define B10101010 0xAA #define B10101011 0xAB #define B10101100 0xAC #define B10101101 0xAD #define B10101110 0xAE #define B10101111 0xAF #define B10110000 0xB0 #define B10110001 0xB1 #define B10110010 0xB2 #define B10110011 0xB3 #define B10110100 0xB4 #define B10110101 0xB5 #define B10110110 0xB6 #define B10110111 0xB7 #define B10111000 0xB8 #define B10111001 0xB9 #define B10111010 0xBA #define B10111011 0xBB #define B10111100 0xBC #define B10111101 0xBD #define B10111110 0xBE #define B10111111 0xBF #define B11000000 0xC0 #define B11000001 0xC1 #define B11000010 0xC2 #define B11000011 0xC3 #define B11000100 0xC4 #define B11000101 0xC5 #define B11000110 0xC6 #define B11000111 0xC7 #define B11001000 0xC8 #define B11001001 0xC9 #define B11001010 0xCA #define B11001011 0xCB #define B11001100 0xCC #define B11001101 0xCD #define B11001110 0xCE #define B11001111 0xCF #define B11010000 0xD0 #define B11010001 0xD1 #define B11010010 0xD2 #define B11010011 0xD3 #define B11010100 0xD4 #define B11010101 0xD5 #define B11010110 0xD6 #define B11010111 0xD7 #define B11011000 0xD8 #define B11011001 0xD9 #define B11011010 0xDA #define B11011011 0xDB #define B11011100 0xDC #define B11011101 0xDD #define B11011110 0xDE #define B11011111 0xDF #define B11100000 0xE0 #define B11100001 0xE1 #define B11100010 0xE2 #define B11100011 0xE3 #define B11100100 0xE4 #define B11100101 0xE5 #define B11100110 0xE6 #define B11100111 0xE7 #define B11101000 0xE8 #define B11101001 0xE9 #define B11101010 0xEA #define B11101011 0xEB #define B11101100 0xEC #define B11101101 0xED #define B11101110 0xEE #define B11101111 0xEF #define B11110000 0xF0 #define B11110001 0xF1 #define B11110010 0xF2 #define B11110011 0xF3 #define B11110100 0xF4 #define B11110101 0xF5 #define B11110110 0xF6 #define B11110111 0xF7 #define B11111000 0xF8 #define B11111001 0xF9 #define B11111010 0xFA #define B11111011 0xFB #define B11111100 0xFC #define B11111101 0xFD #define B11111110 0xFE #define B11111111 0xFF /*----End----*/