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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. int myStrlen(char s[]){
  5.     int i;
  6.     for(i=0;s[i]!='\0';i++);
  7.     return i;
  8. }
  9.  
  10. // 関数の中でtmpに対してmallocして
  11. // そこに回文を代入してreturnで返しましょう
  12. char *setPalindrome(char s[]){
  13.    int len = myStrlen(s);
  14.     char *tmp = (char *)malloc((2 * len + 1) * sizeof(char));
  15.     int i;
  16.     for (i = 0; i < len; i++) {
  17.         tmp[i] = s[i];
  18.     }
  19.     for (i = 0; i < len; i++) {
  20.         tmp[len + i] = s[len - i - 1];
  21.     }
  22.     tmp[2 * len] = '\0';
  23.     return tmp;
  24. }
  25.  
  26.  
  27. //メイン関数はいじる必要はありません
  28. int main(){
  29.     int i;
  30.     char nyuryoku[1024]; //入力
  31.     char *kaibun;   //回文を受け取る
  32.     scanf("%s",nyuryoku);
  33.     kaibun = setPalindrome(nyuryoku);
  34.     printf("%s\n  -> %s\n",nyuryoku,kaibun);
  35.     free(kaibun);
  36.     return 0;
  37. }
  38.  
Success #stdin #stdout 0s 5308KB
comments (?)
stdin
copy 
abcd
stdout
copy 
abcd
  -> abcddcba
https://ideone.com/dd1UcM
language:
C (gcc 8.3)
created:
13 days ago
visibility:
public

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