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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 newLen = len * 2;
  13.     char *tmp = (char *)malloc((newLen + 1) * sizeof(char)); 
  14.  
  15.     if (tmp == NULL) { 
  16.         return NULL;
  17.     }
  18.  
  19.     for (int i = 0; i < len; i++) {
  20.         tmp[i] = s[i];
  21.     }
  22.  
  23.     for (int i = 0; i < len; i++) {
  24.         tmp[len + i] = s[len - i - 1];
  25.     }
  26.  
  27.     tmp[newLen] = '\0'; 
  28.     return tmp;
  29. }
  30.  
  31. int main() {
  32.     char nyuryoku[1024]; 
  33.     char *kaibun;       
  34.     scanf("%s", nyuryoku);
  35.     kaibun = setPalindrome(nyuryoku);
  36.  
  37.     printf("%s\n  -> %s\n", nyuryoku, kaibun);
  38.     free(kaibun);
  39.     return 0;
  40. }
  41.  
Success #stdin #stdout 0s 5288KB
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stdin
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Standard input is empty
stdout
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19**j
  -> 19**jj**91
https://ideone.com/Dq4S2y
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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