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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 size=myStrlen(s);
  14. 	char *tmp=(char*)malloc(sizeof(char)*(2*size+1));
  15. 	int i;
  16. 	 if(tmp == NULL){
  17.         printf("ERROR\n");
  18.         return NULL;
  19.     }
  20.     for(i=0; i<size; i++){
  21.         tmp[i] = s[i];
  22.     }
  23.     for(i = 0; i < size; i++){
  24.         tmp[size + i] = s[size - 1 - i];
  25.     }
  26. tmp[2 * size] = '\0';
  27.  
  28.     return tmp;
  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 5288KB
comments (?)
stdin
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abcd
stdout
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abcd
  -> abcddcba
https://ideone.com/aRD4aG
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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