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  1. #include <stdio.h>
  2.  
  3. int strlen(const char* s)
  4. {
  5. 	int l = 0;
  6. 	while (*s++) ++l;
  7. 	return l;
  8. }
  9.  
  10.  
  11. void reverse(char* str)
  12. {
  13. 	int i = 0, j = strlen(str) - 1;
  14.  
  15. 	for(; i < j; ++i, --j)
  16.     {
  17. 	   str[i] ^= str[j];
  18. 	   str[j] ^= str[i];
  19. 	   str[i] ^= str[j];
  20.     }
  21. }
  22.  
  23. void nulltok(char* str, char tok, int* parts)
  24. {
  25. 	int i = 0, len = strlen(str);
  26. 	*parts = 1;
  27.  
  28. 	for (; i < len; ++i)
  29. 	{
  30. 		if (str[i] == tok)
  31. 		{
  32. 			str[i] = '\0';
  33. 			++(*parts);
  34. 		}
  35. 	}
  36. }
  37.  
  38. char* reverse_sentence(char* str)
  39. {
  40. 	char* tmp = str;
  41. 	reverse(str);
  42.  
  43. 	int i = 0, parts = 0, len = strlen(str);
  44. 	nulltok(str, 0x20, &parts);
  45.  
  46. 	while(parts--)
  47. 	{
  48. 		reverse(str);
  49. 		str += strlen(str) + 1;
  50. 	}
  51.  
  52. 	for(; i < len; ++i)
  53. 	    if (tmp[i] == '\0')
  54. 	        tmp[i] = 0x20;
  55.  
  56. 	return tmp;
  57. }
  58.  
  59.  
  60. int main(void)
  61. {
  62. 	char str[] = "dogs like cats";
  63. 	printf("%s", reverse_sentence(str));
  64.  
  65. 	return 0;
  66. }
  67.  
Success #stdin #stdout 0s 2292KB
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Standard input is empty
stdout
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cats like dogs
https://ideone.com/io6Bh9
language:
C (gcc 8.3)
created:
9 years ago
visibility:
secret

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