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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 totalLen = len * 2;
  13.     char *tmp = (char *)malloc((totalLen + 1) * sizeof(char)); // +1は'\0'用
  14.  
  15.     if(tmp == NULL) {
  16.         printf("メモリ確保に失敗しました\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[totalLen] = '\0'; 
  29.  
  30.     return tmp;
  31. }
  32.  
  33. int main(){
  34.     int i;
  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. }
Success #stdin #stdout 0s 5288KB
comments (?)
stdin 
abcd
stdout 
abcd
  -> abcddcba
https://ideone.com/KHRVTh
language:
C (gcc 8.3)
created:
9 days ago
visibility:
public

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