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  1. #include <ctype.h>
  2. #include <stdbool.h>
  3. #include <stdio.h>
  4. #include <string.h>
  5.  
  6. bool is_identifier(const char *word) {
  7.   if (!((word[0] >= 'a' && word[0] <= 'z') ||
  8.         (word[0] >= 'A' && word[0] <= 'Z') || word[0] == '_')) {
  9.     return 0;
  10.   }
  11.   for (int i = 1; i < strlen(word); i++) {
  12.     if (!((word[i] >= 'a' && word[i] <= 'z') ||
  13.           (word[i] >= 'A' && word[i] <= 'Z') ||
  14.           (word[i] >= '0' && word[i] <= '9') || word[i] == '_')) {
  15.       return 0;
  16.     }
  17.   }
  18.   return 1;
  19. }
  20.  
  21. void reverse_non_identifiers(char *line) {
  22.   char *start = line, *end;
  23.   while (*start != '\0') {
  24.     while (*start == ' ') {
  25.       start++;
  26.     }
  27.     end = start;
  28.     while (*end != ' ' && *end != '\0') {
  29.       end++;
  30.     }
  31.     if (!is_identifier(start)) {
  32.       int len = end - start;
  33.       for (int i = 0; i < len / 2; i++) {
  34.         char temp = start[i];
  35.         start[i] = start[len - i - 1];
  36.         start[len - i - 1] = temp;
  37.       }
  38.     }
  39.     start = end;
  40.   }
  41. }
  42.  
  43. int main() {
  44.   char line[10000000];
  45.   while (fgets(line, sizeof(line), stdin)) {
  46.     char *newline = strtok(line, "\n");
  47.     int len = strlen(newline);
  48.     char *copy = malloc(len + 1);
  49.     strcpy(copy, newline);
  50.     reverse_non_identifiers(copy);
  51.     puts(copy);
  52.     free(copy);
  53.   }
  54.   return 0;
  55. }
  56.  
Success #stdin #stdout 0.01s 5392KB
comments (?)
stdin
copy 
Dato25 has 2 c-ats and 3   _dogs.   .
stdout
copy 
52otaD sah 2 sta-c dna 3   .sgod_   .
https://ideone.com/0OMREB
language:
C (gcc 8.3)
created:
1 year ago
visibility:
public

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