iOS 16进制与10进制的互转

一、整形装换成两个字节

intvalue =456;

unsignedcharbyte1 = (value &0xff00)>>8;//高8位

unsignedcharbyte2 = (value &0xff);//低8位

NSLog(@"byte1= %x   byte2= %x ",byte1,byte2);

byte1 = 1;  byte2= c8;

二、两个字节转换成十进制整数

charbytes[]={byte1,byte2};

unsignedcharby1 = (bytes[0] &0xff);//高8位

unsignedcharby2 = (bytes[1] &0xff);//低8位

inttemp  = (by2|(by1<<8));

NSLog(@"temp = %d",temp);

temp = 456;

三、整形装换成三个字节

intvalue =134456;

unsignedcharbyte1 = (value &0xff0000)>>16;//最高8位

unsignedcharbyte2 = (value &0xff00)>>8;//中间8位

unsignedcharbyte3 = (value &0xff);//低8位

NSLog(@"byte1= %x   byte2= %x byte3= %x ",byte1,byte2,byte3);

byte1= 2   byte2= d byte3= 38

四、三个字节转换成十进制整数

charbytes[]={byte1,byte2,byte3};

unsignedcharby1 = (bytes[0] &0xff);//高8位

unsignedcharby2 = (bytes[1] &0xff);//中8位

unsignedcharby3 = (bytes[2] &0xff);//低8位

inttemp  = (by3|(by2<<8)|(by1<<16));

NSLog(@"temp = %d",temp);

temp = 134456

转：http://blog.csdn.net/qq_26705543/article/details/51065225