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  1. #include <stdio.h>
  2.  
  3. unsigned char convert(unsigned char ch)
  4. {
  5.     if (ch >= '0' && ch <= '9')
  6.     {
  7.         return ch -'0';
  8.     }
  9.  
  10.     if (ch >= 'a' && ch <= 'f')
  11.     {
  12.         return ch -'a' + 10;
  13.     }
  14.  
  15.     if (ch >= 'A' && ch <= 'F')
  16.     {
  17.         return ch -'A' + 10;
  18.     }
  19.  
  20.     return 0; // or some error handling
  21. }
  22. int main(void) {
  23.     unsigned char tag[8] = "50C59390";
  24.     unsigned char buffer[4] = {0};
  25.     int index,j = 0;    
  26.     for(index = 0 ; index < 8; index = index + 2)
  27.     {   
  28.         buffer[j] = convert(tag[index]) << 4;
  29.         buffer[j] += convert(tag[index+1]);
  30.  
  31.         printf("%02X", buffer[j]);
  32.         j++;
  33.     }    
  34. 	return 0;
  35. }
  36.  
Success #stdin #stdout 0s 4176KB
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50C59390
https://ideone.com/e2FPCT
language:
C (gcc 8.3)
created:
5 years ago
visibility:
secret

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