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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. #define S_SPACE 0
  6. #define S_CHAR 1
  7.  
  8. void substr(char buf[], char *str, int wstart, int wend) {
  9.     strncpy(buf, str + wstart, wend - wstart + 1);
  10.     buf[wend - wstart + 1] = '\0';
  11. }
  12.  
  13. main()
  14. {
  15.     char *s = "It was a pleasant evening.  A boy and a girl sat in the park.";
  16.     int i, j, state, newstate;
  17.     char *caption;
  18.     char status[80], wordbuf[80];
  19.     int wordstart, wordend, wordlen;
  20.  
  21.     i = strlen(s);
  22.     state = isspace(s[i]) ? S_SPACE : S_CHAR;
  23.     --i;
  24.     wordend = i;
  25.  
  26.     while (i >= 0) {
  27.         newstate = isspace(s[i]) ? S_SPACE : S_CHAR;
  28.         if (newstate != state) {
  29.             if (newstate == S_SPACE) {
  30.                 substr(wordbuf, s, i + 1, wordend);
  31.                 printf("%s ", wordbuf);
  32.             }
  33.             else {
  34.                 wordend = i;
  35.             }
  36.             state = newstate;
  37.         }
  38.         else {
  39.         }
  40.         --i;
  41.     }
  42.  
  43.     // Dump the remains if still in char state
  44.     if (state == S_CHAR) {
  45.         substr(wordbuf, s, 0, wordend);
  46.         printf("%s\n", wordbuf);
  47.     }
  48.  
  49.     return 0;
  50. }
  51.  
Success #stdin #stdout 0.01s 1720KB
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stdin
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Standard input is empty
stdout
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park. the in sat girl a and boy A evening. pleasant a was It
https://ideone.com/QICluS
reverse-sentence-by-word
language:
C (gcc 8.3)
created:
13 years ago
visibility:
public

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