整数转换成16进制字符串的程序

1. #include <stdio.h>
2. #include <stdlib.h>
4. char * itoa_hex(unsigned int data,char * hbuff)
5. {
6.     unsigned char * p=(unsigned char *)(&data);
7.     int len=sizeof(data);
8.     
9.     static const char hex_map[]="0123456789ABCDEF";
10.     static const bool lit_end=*(char*)(&len)==len;
11.     
12.     int counter=0;
13.     if(lit_end)
14.     {
15.         for(counter=len;counter>0;--counter)
16.         {
17.             hbuff[(len-counter)<<1]=hex_map[*(p+counter-1)>>4];
18.             hbuff[((len-counter)<<1)|1]=hex_map[(*(p+counter-1))&0XF];
19.         }
20.     }
21.     else
22.     {
23.         for(;counter<len;++counter)
24.         {
25.             hbuff[counter<<1]=hex_map[*(p+counter-1)>>4];
26.             hbuff[(counter<<1)|1]=hex_map[*(p+counter-1)|0X0F];
27.         }
28.     }
29.     return hbuff;
30. }
32. int main(int argc, char * argv[])
33. {
34.     char buff[32]="";
35.     itoa_hex(atoi(argv[1]),buff);
36.     printf("%s/n",buff);
37.     return 0;
38. }