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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. char *setPalindrome(char s[]) {
  11.     int len = myStrlen(s); 
  12.     int new_len = len * 2;
  13.     char *tmp = (char *)malloc((new_len + 1) * sizeof(char));
  14.  
  15.     if (tmp == NULL) {
  16.         printf("Memory allocation failed\n");
  17.         exit(1);
  18.     }
  19.  
  20.     for (int i = 0; i < len; i++) {
  21.         tmp[i] = s[i];
  22.     }
  23.  
  24.     for (int i = 0; i < len; i++) {
  25.         tmp[len + i] = s[len - 1 - i];
  26.     }
  27.  
  28.     tmp[new_len] = '\0';
  29.     return tmp;
  30. }
  31.  
  32. int main() {
  33.     char nyuryoku[1024];
  34.     char *kaibun;
  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 5280KB
comments (?)
stdin 
abcd
stdout 
abcd
  -> abcddcba
https://ideone.com/G9gZAY
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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