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  1. #include <stdio.h>
  2. #include <string.h>
  3. void reverse_char_array(char * first, char * last) {
  4.     while (first != last && first != --last) {
  5.         *first ^= *last;
  6.         *last ^= *first;
  7.         *first++ ^= *last;
  8.     }
  9. }
  10. void reverse_string(char * sentence) {
  11.     reverse_char_array(sentence, &sentence[strlen(sentence)]);
  12. }
  13. void reverse_word(char * sentence) {
  14.     char * end_s = &sentence[strlen(sentence)], * end_w = NULL;
  15.     while (end_w != end_s) {
  16.         if (!(end_w = strchr(sentence, ' '))) end_w = end_s;
  17.         reverse_char_array(sentence, end_w);
  18.         sentence = end_w + 1;
  19.     }
  20. }
  21. int main(int argc, char ** argv) {
  22.     char sentence[] = "Shall we all die?  We shall die all!  All die shall we?  Die all we shall!";
  23.     reverse_string(sentence);
  24.     reverse_word(sentence);
  25.     printf("%s\n", sentence);
  26.     return 0;
  27. }
Success #stdin #stdout 0.01s 1676KB
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Standard input is empty
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shall! we all Die  we? shall die All  all! die shall We  die? all we Shall
https://ideone.com/BP6IuE
language:
C (gcc 8.3)
created:
13 years ago
visibility:
public

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