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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.     char *tmp;
  14.     int i;
  15.     int len = myStrlen(s);
  16.  
  17.     tmp = (char *)malloc(sizeof(char) * (len * 2 + 1));
  18.     if(tmp == NULL){
  19.         return NULL;
  20.     }
  21.  
  22.     for(i=0;i<len;i++){
  23.         tmp[i] = s[i];                 
  24.         tmp[len*2 - 1 - i] = s[i];    
  25.     }
  26.     tmp[len*2] = '\0';                
  27.  
  28.     return tmp;
  29. }
  30.  
  31. //メイン関数はいじる必要はありません
  32. int main(){
  33.     int i;
  34.     char nyuryoku[1024]; //入力
  35.     char *kaibun;   //回文を受け取る
  36.     scanf("%s",nyuryoku);
  37.     kaibun = setPalindrome(nyuryoku);
  38.     printf("%s\n  -> %s\n",nyuryoku,kaibun);
  39.     free(kaibun);
  40.     return 0;
  41. }
Success #stdin #stdout 0s 544KB
comments (?)
stdin
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abcd
stdout
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abcd
  -> abcddcba
https://ideone.com/52iNgG
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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