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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 len = myStrlen(s);
  15.     int size= len * 2; 
  16.  
  17.     tmp = (char*)malloc(sizeof(char)*(size+1));
  18.     if (tmp == NULL) {
  19.         printf("ERROR\n");
  20.         return 0;
  21.     }
  22.  
  23.     for (int i = 0; i < len; i++) {
  24.         tmp[i] = s[i];
  25.     }
  26.  
  27.     for (int i = 0; i < len; i++) {
  28.         tmp[len + i] = s[len - i - 1];
  29.     }
  30.  
  31.     tmp[size] = '\0';
  32.  
  33.     return tmp;
  34. }
  35.  
  36. // メイン関数はいじる必要はありません
  37. int main(){
  38.     int i;
  39.     char nyuryoku[1024]; // 入力
  40.     char *kaibun;   // 回文を受け取る
  41.     scanf("%s", nyuryoku);
  42.     kaibun = setPalindrome(nyuryoku);
  43.     printf("%s\n  -> %s\n", nyuryoku, kaibun);
  44.     free(kaibun);
  45.     return 0;
  46. }
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin
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abcd
stdout
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abcd
  -> abcddcba
https://ideone.com/fhnJC6
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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