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  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4. void reverse(char*, int);
  5.  
  6. int main(int argc, char **argv)
  7. {
  8. 	char st[]= "hello world";
  9. 	int len = strlen(st);
  10. 	int i=0,j=0;
  11.  
  12. 	reverse(st,len-1); // Reverse the entire string. hello world => dlrow olleh
  13.  
  14. 	while(st[j]){ //Loop till the string ends
  15. 		if (*(st+j)==' ') { //if you hit a blank space 
  16. 			reverse(st+i,j-i-1); // reverse the string starting at position i till position j
  17. 			i=++j; //new i & j are 1 position to the right of old j
  18. 		}
  19. 		else {
  20. 			j++; //if a chacacter is found, move to next position
  21. 		}		
  22. 	}		
  23. 	reverse(st+i,j-i-1); // reverse the last word of the string
  24.  
  25. 	printf("%s",st);
  26. 	return 0;
  27. }
  28.  
  29. void reverse(char *s, int n)
  30. {
  31. 	char *end = s+n; //end is a pointer to an address which is n addresses from the starting address
  32. 	char tmp;
  33. 	while (end>s)  //perform swap
  34. 	{
  35. 		tmp = *end;
  36. 		*end = *s;
  37. 		*s = tmp;
  38. 		end--;
  39. 		s++;
  40. 	}
  41. }
Success #stdin #stdout 0.02s 1676KB
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stdin
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Standard input is empty
stdout
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world hello
https://ideone.com/TYw1k
language:
C (gcc 8.3)
created:
13 years ago
visibility:
public

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