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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 size;
  16.  
  17.     size = myStrlen(s);
  18.  
  19.     tmp = (char *)malloc(sizeof(char) * (2 * size + 1));
  20.  
  21.     if(tmp == NULL){
  22.         printf("ERROR\n");
  23.         return NULL;
  24.     }
  25.  
  26.     for(i=0;i<size;i++){
  27.         tmp[i] = s[i];
  28.     }
  29.  
  30.     for(i=0;i<size;i++){
  31.         tmp[i+size] = s[size-i-1];
  32.     }
  33.  
  34.     tmp[2*size] = '\0';
  35.  
  36.     return tmp;
  37. }
  38.  
  39.  
  40. //メイン関数はいじる必要はありません
  41. int main(){
  42.     int i;
  43.     char nyuryoku[1024]; //入力
  44.     char *kaibun;   //回文を受け取る
  45.  
  46.     scanf("%s",nyuryoku);
  47.  
  48.     kaibun = setPalindrome(nyuryoku);
  49.  
  50.     printf("%s\n  -> %s\n",nyuryoku,kaibun);
  51.  
  52.     free(kaibun);
  53.  
  54.     return 0;
  55. }
Success #stdin #stdout 0s 5280KB
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stdin
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abcd
stdout
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abcd
  -> abcddcba
https://ideone.com/Abc9Tx
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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