Convert binary to hexadecimal

convert binary to hexadecimal

1. basic principle: Because the hexadecimal number base is the four power of 2, a binary is converted to a hexadecimal number. If it is an integer, from its low position to the high position, every four digits constitute a group, and then each group is The number corresponding to the number is expressed in hexadecimal notation. If there is a decimal part, the group is calculated from the decimal point to the left and right sides according to the method described.

(11010111100010111) 2 = (3af17) 16

original:

http://www.chinatax.gov.cn/jypx/jsjjczs/zp_2to16.htm

2. binary-hexadecimal relationship

binary system 0000 0001 0010 0011 0100 0101 0110

hexadecimal 0 1 2 3 4 5 6 7

binary system 1000 1001 1010 1011 1100 1101 1110

hexadecimal 8 9 A (10) B (11) C (12) D (13) E (14) f (15)

the binary number of four digits can be used to represent a hexadecimal value. For example, if the binary number of (3A) 16 is:

3 is 0011, A is 1010, and merge to 00111010. Remove the leftmost 0 value (111010) 2

right: Convert binary to hexadecimal, you only need to separate the digits of the binary from the left to the left, and compare the units with the hexadecimal values.

3. example 1

file * DEST = fopen (" aa.txt ", "R +"); // write a hexadecimal file

file * src = fopen (". CPP "," R "); // Read File

while (CH = GETC (SRC ))! = EOF)

{

fprintf (DEST," % 2x ", CH );

}

4. Example 2

Char * bin2hex (char * SRC, unsigned int size)

{

Char Dest [100] = {0 };

If (sizeof (DEST)/2 <size)

{

Size = sizeof (DEST)/2;

}

For (INT I = 0; I <size; I ++)

{

Sprintf (& Dest [I * 2], "% 2x", (unsigned char) SRC [I]);

}

Return DEST;

}

original:

http://zhidao.baidu.com/question/185562563.html

More details

http://www.cnblogs.com/lds85930/archive/2007/09/19/897912.html

Http://bbs.csdn.net/topics/270017393