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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. int isPalindrome(char s[]){
  5. 	int i,j;
  6. 	for(i=0;s[i]!='\0';i++);
  7. 	for(j=0;j<i;j++){
  8. 		i--;
  9. 		if(s[i]!=s[j]) return 0;
  10. 	}
  11. 	return 1;
  12. }
  13.  
  14. char *setPalindrome(char s[]){
  15. 	char *tmp;
  16. 	int i;
  17. 	for(i=0;s[i]!='\0';i++);
  18. 	int j,k;
  19. 	tmp = (char*)malloc(sizeof(char)*i*2);
  20. 	if(tmp==NULL){
  21. 		printf("ERROR\n");
  22. 		return 0;
  23. 	}
  24.     for(j=0;j<i;j++){
  25.         tmp[j] = s[j];
  26.     }
  27. 	for(j=i;isPalindrome(tmp)==0;j++){
  28. 		//printf("j=%d\n",j);
  29. 		for(k=0;k<j-i;k++){
  30. 			tmp[j-k-1]=tmp[k];
  31. 		}
  32. 		tmp[j]='\0';
  33. 		//printf("%s\n",tmp);
  34. 	}
  35. 	return tmp;
  36. }
  37.  
  38. int main(){
  39.     int i;
  40.     char nyuryoku[1024];
  41.     char *kaibun;
  42.     scanf("%s",nyuryoku);
  43.     kaibun = setPalindrome(nyuryoku);
  44.     printf("%s\n  -> %s\n",nyuryoku,kaibun);
  45.     free(kaibun);
  46.     return 0;
  47. }
  48.  
Success #stdin #stdout 0s 5284KB
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stdin
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abcd
stdout
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abcd
  -> abcdcba
https://ideone.com/Rr0dwY
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

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