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  1. #include <stdlib.h>
  2.  
  3. int myStrlen(char s[]){
  4.     int i;
  5.     for(i=0;s[i]!='\0';i++);
  6.     return i;
  7. }
  8.  
  9. // 関数の中でtmpに対してmallocして
  10. // そこに回文を代入してreturnで返しましょう
  11. char *setPalindrome(char s[]){
  12. 	char *tmp;
  13. 	int len = myStrlen(s);
  14.     int i;
  15.     tmp = (char *)malloc(sizeof(char) * (len * 2 + 1));
  16.     if (tmp == NULL) {
  17.         return NULL;
  18.     }
  19.     for (i = 0; i < len; i++) {
  20.         tmp[i] = s[i];
  21.     }
  22.     for (i = 0; i < len; i++) {
  23.         tmp[len + i] = s[len - 1 - i];
  24.     }
  25.     tmp[len * 2] = '\0';
  26.  
  27.     return tmp;
  28. }
  29.  
  30. //メイン関数はいじる必要はありません
  31. int main(){
  32.     int i;
  33.     char nyuryoku[1024]; //入力
  34.     char *kaibun;   //回文を受け取る
  35.     scanf("%s",nyuryoku);
  36.     kaibun = setPalindrome(nyuryoku);
  37.     printf("%s\n  -> %s\n",nyuryoku,kaibun);
  38.     free(kaibun);
  39.     return 0;
  40. }
  41.  
Success #stdin #stdout 0s 5324KB
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stdin
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abcd
stdout
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abcd
  -> abcddcba
https://ideone.com/xmO5uq
language:
C (gcc 8.3)
created:
13 hours ago
visibility:
public

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