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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. char *crePalindrome(char s[]){
  6.     int i;
  7.     int len = strlen(s);
  8.     char *p;
  9.  
  10.     p = (char *)malloc(sizeof(char) * (len * 2 + 1));
  11.  
  12.     for(i = 0; i < len; i++){
  13.         p[i] = s[i];
  14.     }
  15.  
  16.     for(i = 0; i < len; i++){
  17.         p[len + i] = s[len - 1 - i];
  18.     }
  19.  
  20.     p[len * 2] = '\0';
  21.  
  22.     return p;
  23. }
  24.  
  25. int main(void){
  26.     char s[100];
  27.     char *ans;
  28.  
  29.     scanf("%s", s);
  30.  
  31.     ans = crePalindrome(s);
  32.     printf("%s\n", ans);
  33.  
  34.     free(ans);
  35.  
  36.     return 0;
  37. }
  38.  
Success #stdin #stdout 0s 5316KB
comments (?)
stdin 
abcd
stdout 
abcddcba
https://ideone.com/WWrvEt
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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