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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 i;
  13.     char *tmp;
  14.  
  15.     tmp = (char *)malloc((2 * len + 1) * sizeof(char));
  16.     if (tmp == NULL) {
  17.         printf("Memory allocation failed.\n");
  18.         exit(1);
  19.     }
  20.  
  21.     for (i = 0; i < len; i++) {
  22.         tmp[i] = s[i];
  23.     }
  24.  
  25.     for (i = 0; i < len; i++) {
  26.         tmp[len + i] = s[len - 1 - i];
  27.     }
  28.  
  29.     tmp[2 * len] = '\0';
  30.  
  31.     return tmp;
  32. }
  33.  
  34. int main() {
  35.     char nyuryoku[1024]; 
  36.     char *kaibun;       
  37.     scanf("%s", nyuryoku);
  38.     kaibun = setPalindrome(nyuryoku);
  39.     printf("%s\n  -> %s\n", nyuryoku, kaibun);
  40.     free(kaibun); 
  41.     return 0;
  42. }
  43.  
  44.  
Success #stdin #stdout 0s 5280KB
comments (?)
stdin 
abcd
stdout 
abcd
  -> abcddcba
https://ideone.com/yUp4W9
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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