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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. // 文字列の長さを求める関数
  5. int myStrlen(char s[]) {
  6.     int i;
  7.     for (i = 0; s[i] != '\0'; i++);
  8.     return i;
  9. }
  10.  
  11. // 回文を作成する関数
  12. char *setPalindrome(char s[]) {
  13.     int len = myStrlen(s); 
  14.     char *tmp = (char *)malloc((2 * len + 1) * sizeof(char));
  15.  
  16.     if (tmp == NULL) {
  17.         return NULL;
  18.     }
  19.     for (int i = 0; i < len; i++) {
  20.         tmp[i] = s[i];
  21.     }
  22.     for (int i = 0; i < len; i++) {
  23.         tmp[len + i] = s[len - 1 - i];
  24.     }
  25.  
  26.     tmp[2 * len] = '\0'; 
  27.     return tmp;
  28. }
  29. //メイン関数はいじる必要はありません
  30. int main(){
  31.     char nyuryoku[1024]; //入力
  32.     char *kaibun;   //回文を受け取る
  33.     scanf("%s",nyuryoku);
  34.     kaibun = setPalindrome(nyuryoku);
  35.     printf("%s\n  -> %s\n",nyuryoku,kaibun);
  36.     free(kaibun);
  37.     return 0;
  38. }
  39.  
Success #stdin #stdout 0.01s 5244KB
comments (?)
stdin
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hello
stdout
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hello
  -> helloolleh
https://ideone.com/omA9Wf
language:
C99 (gcc 8.3)
created:
9 days ago
visibility:
public

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