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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. // 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. 	int len=myStrlen(s);
  13.     int total=len*2;
  14.  
  15. 	char *tmp=(char*)malloc(sizeof(char)*(total+1));
  16.  
  17. 	if(tmp==NULL){
  18. 		printf("ERROR\n");
  19. 		return 0;
  20. 	}
  21. 	for(int i=0; i<len; i++){
  22. 		tmp[i]=s[i];
  23. 	}
  24. 	for(int i=0; i<len; i++){
  25. 		tmp[len+i]=s[len-1-i];
  26. 	}
  27. 	return tmp;
  28.  
  29. }
  30.  
  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. }
Success #stdin #stdout 0s 5284KB
comments (?)
stdin 
abcd
stdout 
abcd
  -> abcddcba
https://ideone.com/w7jBMO
language:
C (gcc 8.3)
created:
5 days ago
visibility:
public

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