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  1. #include <stdio.h>
  2. #include <memory.h>
  3.  
  4. #define BEGIN_HEX 0	/*Íà÷àëî çàïèñè 16-ðè÷íîãî ÷èñëà*/
  5. #define HEX 1		/*Òî÷íî èçâåñòíî, ÷òî ýòî 16-ðè÷íîå ÷èñëî*/
  6. #define NUMBER 2	/* çíà÷àùåé ÷àñòè 16-ðè÷íîãî ÷èñëà*/
  7. #define STRING 3	/*Åñëè ïåðåäàíî íå ÷èñëî, à ëþáàÿ ñòðîêà*/
  8. #define START_PARSING 4
  9.  
  10. int htoi(char s[]);
  11.  
  12. int main(void){
  13. 	int i;
  14.  
  15. 	/*0x1F = 31*/
  16. 	/*0xAF = 175*/
  17. 	i = htoi("0xaf");
  18. 	printf("%d\n", i);
  19. 	return 0;
  20. }
  21.  
  22. int htoi(char s[]){
  23. 	int res;
  24. 	int i;
  25. 	int state;
  26.  
  27. 	i = res = 0;
  28. 	state = START_PARSING;
  29. 	while(s[i] != '\0'){
  30. 		if(s[i] == '0')
  31. 			if(state == START_PARSING)
  32. 				{state = BEGIN_HEX; printf("state = BEGIN_HEX\n");}
  33. 			else
  34. 				{state == STRING; printf("state = STRING1\n"); }
  35. 		else if(s[i] == 'x')
  36. 			if(state == BEGIN_HEX)
  37. 				{state = HEX; printf("state = HEX\n");}
  38. 			else
  39. 				{state = STRING; printf("state = STRING2\n");}
  40. 		else if(state == HEX){	/*Íà÷èíàåì ðàçáîð 16-ðè÷íîãî ÷èñëà*/
  41. 			if(s[i] >= '0' && s[i] <= '9' ){
  42. 				res = res*16 + (s[i] - '0');
  43. 				printf("s[i] = %d\n", s[i]);
  44. 				printf("s[i] - 0 = %d\n", s[i] - '0');
  45. 			}else if(s[i] >= 'a' && s[i] <= 'f'){
  46. 				res = res*16 + (s[i] - 'a') + 10;
  47. 				printf("s[i] = %d\n", s[i]);
  48. 				printf("s[i] - 0 = %d\n", s[i] - 'a' + 10);
  49. 			}else{
  50. 				state = STRING;
  51. 				printf("state = STRING");
  52. 			}
  53. 		}
  54. 		i++;	
  55. 	}
  56.  
  57. 	return res;
  58. }
Success #stdin #stdout 0s 3460KB
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stdout
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state = BEGIN_HEX
state = HEX
s[i] = 97
s[i] - 0 = 10
s[i] = 102
s[i] - 0 = 15
175
https://ideone.com/MhODHp
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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