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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,a;
  15. 	a = myStrlen(s);
  16.     tmp = (char *)malloc(sizeof(char)*(2*a+1));
  17.     if(tmp == NULL){
  18.         printf("ERROR\n");
  19.         return NULL; 
  20.     }
  21.     for(i=0;i<a;i++){
  22. 	tmp[i] = s[i];
  23. 	}
  24.     for(i=0;i<a;i++){ 
  25. 	tmp[i+a] = s[a-i-1];
  26.     tmp[2*a] = '\0';
  27.     }
  28. 	return tmp;
  29. }
  30.  
  31.  
  32. //メイン関数はいじる必要はありません
  33. int main(){
  34.     int i;
  35.     char nyuryoku[1024]; //入力
  36.     char *kaibun;   //回文を受け取る
  37.     scanf("%s",nyuryoku);
  38.     kaibun = setPalindrome(nyuryoku);
  39.     printf("%s\n  -> %s\n",nyuryoku,kaibun);
  40.     free(kaibun);
  41.     return 0;
  42. }
  43.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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abcd
stdout
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abcd
  -> abcddcba
https://ideone.com/wqDJ9p
language:
C (gcc 8.3)
created:
14 days ago
visibility:
public

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