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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. uint32_t hexChars[8] = {0};
  5.  
  6. uint32_t isHex(uint8_t ch)
  7. {
  8. 	return hexChars[ch >> 5] & (1 << (ch & 0x1F));
  9. }
  10.  
  11. void setBits(char *s)
  12. {
  13. 	while (*s)
  14. 	{
  15. 		hexChars[(*s) >> 5] |= (1 << ((*s) & 0x1F));
  16. 		s++;
  17. 	}
  18. }
  19.  
  20. int main(void) {
  21. 	int i;
  22. 	uint8_t test[] = "A test for hex characters 0123456789ABCDEFabcdef";
  23. 	setBits("0123456789ABCDEFabcdef");
  24.  
  25. 	for (i = 0; i < 8; ++i)
  26. 		printf("%08x, ", hexChars[i]);
  27.  
  28. 	for (i = 0; i < strlen(test); ++i)
  29. 	{
  30. 		if (isHex(test[i]))
  31. 			printf("%c is a hex character\n", test[i]);
  32. 		else
  33. 			printf("%c is NOT a hex character\n", test[i]);
  34. 	}
  35. 	return 0;
  36. }
  37.  
Success #stdin #stdout 0s 5636KB
comments (?)
stdin 
Standard input is empty
stdout 
00000000, 03ff0000, 0000007e, 0000007e, 00000000, 00000000, 00000000, 00000000, A is a hex character
  is NOT a hex character
t is NOT a hex character
e is a hex character
s is NOT a hex character
t is NOT a hex character
  is NOT a hex character
f is a hex character
o is NOT a hex character
r is NOT a hex character
  is NOT a hex character
h is NOT a hex character
e is a hex character
x is NOT a hex character
  is NOT a hex character
c is a hex character
h is NOT a hex character
a is a hex character
r is NOT a hex character
a is a hex character
c is a hex character
t is NOT a hex character
e is a hex character
r is NOT a hex character
s is NOT a hex character
  is NOT a hex character
0 is a hex character
1 is a hex character
2 is a hex character
3 is a hex character
4 is a hex character
5 is a hex character
6 is a hex character
7 is a hex character
8 is a hex character
9 is a hex character
A is a hex character
B is a hex character
C is a hex character
D is a hex character
E is a hex character
F is a hex character
a is a hex character
b is a hex character
c is a hex character
d is a hex character
e is a hex character
f is a hex character
https://ideone.com/F6hJ6P
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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