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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 i=0, j=0;
  10.  
  11.   while(st[j]){ //Loop till end of the string
  12.     if ( st[j] == ' ') { //if you hit a blank space or the end of the string
  13.       reverse(&st[i], j - i - 1); // reverse the string starting at position i till position before the blank space i.e j-1
  14.       i = ++j; //new i & j are 1 position to the right of old j
  15.     }
  16.     else {
  17.       j++; //if a chacacter is found, move to next position
  18.     }               
  19.   }
  20.   reverse(&st[i], j - i - 1);
  21.  
  22.  
  23.   printf("%s\n",st);
  24.   return 0;
  25. }
  26.  
  27. void reverse(char *s, int n)
  28. {
  29.   char *end = s + n; //end is a pointer to an address which is n addresses from the    starting address
  30.   char tmp;
  31.  
  32.   while (end > s)  //perform swap
  33.   {
  34.     tmp = *end;
  35.     *end = *s;
  36.     *s = tmp;
  37.     end--;
  38.     s++;
  39.   }
  40. }
Success #stdin #stdout 0.01s 1720KB
comments (?)
stdin 
Standard input is empty
stdout 
olleh dlrow
https://ideone.com/edomq
language:
C (gcc 8.3)
created:
13 years ago
visibility:
public

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