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  1. #include <iostream>
  2. #include <string>
  3. #include <iomanip>
  4.  
  5. unsigned char hex2dec(const std::string &s, size_t pos)
  6. {
  7. 	char ch = s[pos];
  8.  
  9. 	if (ch >= 'A' && ch <= 'F')
  10. 		return (ch - 'A') + 10;
  11.  
  12. 	if (ch >= 'a' && ch <= 'f')
  13. 		return (ch - 'a') + 10;
  14.  
  15. 	if (ch >= '0' && ch <= '9')
  16. 		return (ch - '0');
  17.  
  18. 	// error!
  19. 	return 0;
  20. }
  21.  
  22. unsigned char decodeHexByte(const std::string &s, size_t pos)
  23. {
  24. 	return (hex2dec(s, pos) << 4) | hex2dec(s, pos+1);
  25. }
  26.  
  27. int main()
  28. {
  29. 	std::string keyInStr = "1314191A1B";
  30. 	unsigned char keyInHex[5] = {};
  31.  
  32. 	for (int i = 0, j = 0; i < 5; ++i, j += 2)
  33. 	{
  34.     	keyInHex[i] = decodeHexByte(keyInStr, j);
  35. 		std::cout << std::hex << std::setw(2) << std::setfill('0') << (int) keyInHex[i] << " ";
  36.    	}
  37.  
  38. 	return 0;
  39. }
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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13 14 19 1a 1b
https://ideone.com/dZAsDP
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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