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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. char* setPalindrome(const char* s) {
  6.     int len = strlen(s);
  7.  
  8.     char* palindrome = (char*)malloc(sizeof(char) * (len * 2 + 1));
  9.  
  10.     if (palindrome == NULL) {
  11.         return NULL;
  12.     }
  13.  
  14.     strcpy(palindrome, s);
  15.  
  16.     for (int i = 0; i < len; i++) {
  17.         palindrome[len + i] = s[len - 1 - i];
  18.     }
  19.  
  20.     palindrome[len * 2] = '\0';
  21.  
  22.     return palindrome;
  23. }
  24.  
  25. int main() {
  26.     char input[100];
  27.  
  28.     scanf("%s", input);
  29.  
  30.     char* result = setPalindrome(input);
  31.  
  32.     if (result != NULL) {
  33.         printf("作成された回文: %s\n", result);
  34.  
  35.         free(result);
  36.     }
  37.  
  38.     return 0;
  39. }
Success #stdin #stdout 0s 5288KB
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作成された回文: aa
https://ideone.com/fbgA9R
language:
C (gcc 8.3)
created:
15 hours ago
visibility:
public

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