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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.     // 元の文字列 + 逆順文字列 + 終端'\0' の長さを確保
  13.     char *tmp = malloc((len * 2 + 1) * sizeof(char));
  14.     if (tmp == NULL) {
  15.         perror("malloc");
  16.         exit(EXIT_FAILURE);
  17.     }
  18.     // 前半：入力文字列をコピー
  19.     for (int i = 0; i < len; i++) {
  20.         tmp[i] = s[i];
  21.     }
  22.     // 後半：入力文字列を逆順でコピー
  23.     for (int i = 0; i < len; i++) {
  24.         tmp[len + i] = s[len - 1 - i];
  25.     }
  26.     // ヌル文字をセット
  27.     tmp[len * 2] = '\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.     printf("%s\n  -> %s\n", nyuryoku, kaibun);
  37.     free(kaibun);
  38.     return 0;
  39. }
  40.  
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin
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abcd
stdout
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abcd
  -> abcddcba
https://ideone.com/1SnFrC
language:
C (gcc 8.3)
created:
14 days ago
visibility:
public

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