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  1. #include <stdio.h>
  2.  
  3. #define ASCII_0_VALU 48
  4. #define ASCII_9_VALU 57
  5. #define ASCII_A_VALU 65
  6. #define ASCII_F_VALU 70
  7.  
  8. unsigned int HexStringToUInt(char const* hexstring)
  9. {
  10. 	unsigned int result = 0;
  11. 	char const *c = hexstring;
  12. 	char thisC;
  13.  
  14. 	while( (thisC = *c) != NULL )
  15. 	{
  16. 		unsigned int add;
  17. 		thisC = toupper(thisC);
  18.  
  19. 		result <<= 4;
  20.  
  21. 		if( thisC >= ASCII_0_VALU &&  thisC <= ASCII_9_VALU )
  22. 			add = thisC - ASCII_0_VALU;
  23. 		else if( thisC >= ASCII_A_VALU && thisC <= ASCII_F_VALU)
  24. 			add = thisC - ASCII_A_VALU + 10;
  25. 		else
  26. 		{
  27. 			printf("Unrecognised hex character \"%c\"\n", thisC);
  28. 			exit(-1);
  29. 		}
  30.  
  31. 		result += add;
  32. 		++c;
  33. 	}
  34.  
  35. 	return result;	
  36. }
  37.  
  38. int main(void) 
  39. {
  40. 	printf("\nANSWER(\"12FF\"): %d\n", HexStringToUInt("12FF"));
  41. 	printf("\nANSWER(\"abcd\"): %d\n", HexStringToUInt("abcd"));
  42.  
  43. 	return 0;
  44. }
  45.  
Success #stdin #stdout 0s 2248KB
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stdout
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ANSWER("12FF"): 4863

ANSWER("abcd"): 43981
https://ideone.com/YNNmqa
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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