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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. char* setPalindrome(char *s) {
  6.     int len = strlen(s);
  7.  
  8.  
  9.     char *pal = (char*)malloc(sizeof(char) * (len * 2 + 1));
  10.     if (pal == NULL) return NULL;
  11.  
  12.  
  13.     for (int i = 0; i < len; i++) {
  14.         pal[i] = s[i];
  15.     }
  16.  
  17.  
  18.     for (int i = 0; i < len; i++) {
  19.         pal[len + i] = s[len - 1 - i];
  20.     }
  21.  
  22.     pal[len * 2] = '\0';  
  23.  
  24.     return pal;
  25. }
  26.  
  27. int main(void) {
  28.     char s[100];
  29.  
  30.     printf("文字列を入力：");
  31.     scanf("%99s", s);
  32.  
  33.     char *result = setPalindrome(s);
  34.     printf("回文：%s\n", result);
  35.  
  36.     free(result);
  37.  
  38.     return 0;
  39. }
  40.  
Success #stdin #stdout 0s 5288KB
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あい
stdout
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文字列を入力：回文：あい��め�
https://ideone.com/F70nHd
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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