1. #include <stdio.h>
  2. #include <string.h>
  3. #include <conio.h>
  4.  
  5. void reverse_block(char* p, int start, int len)
  6. {
  7. 	int a, b; a = b = 0;
  8. 	for (a = start, b = start+len; a <= b; a++, b--)
  9. 	{
  10. 		char tmp = p[a];
  11. 		p[a] = p[b];
  12. 		p[b] = tmp;
  13. 	}
  14. }
  15.  
  16. // I like pie
  17. // eip ekil I
  18. // pie like I
  19. void reverse_words(char* p)
  20. {
  21. 	// I like pie
  22. 	int len = strlen(p)-1;
  23. 	for (int idx = 0; idx < (len/2); idx++)
  24. 	{
  25. 		char tmp = p[idx];
  26. 		p[idx] = p[len-idx];
  27. 		p[len-idx] = tmp;
  28. 	}
  29. 	// eip ekil I
  30. 	int block_start = 0;
  31. 	int block_end   = 0;
  32. 	for (int idx = 0; idx <= len+1; idx++)
  33. 	{
  34. 		if (p[idx] == ' ' || p[idx] == '\0')
  35. 		{
  36. 			block_end = idx-1;
  37. 			reverse_block(p, block_start, block_end - block_start);
  38. 			block_start = block_end + 2;
  39. 		}
  40. 		else
  41. 		{
  42. 			continue;
  43. 		}
  44. 	}
  45. }
  46.  
  47.  
  48. int main()
  49. {
  50. 	char buf[64];
  51. 	strcpy(buf, "Here is an example sentence for testing");
  52.  
  53. 	printf("%s\n", buf);
  54. 	reverse_words(buf);
  55. 	printf("%s\n", buf);
  56.  
  57. 	getchar();
  58.  
  59. 	return 0;
  60. }