什么是C语言中的变位词（anagram）？

#include <stdio.h>
int check_anagram(char [], char []);
int main(){
   char a[1000], b[1000];
   printf("Enter two strings</p><p>");
   gets(a);
   gets(b);
   if (check_anagram(a, b))
      printf("The strings are anagrams.</p><p>");
   else
      printf("The strings aren't anagrams.</p><p>");
      return 0;
}
int check_anagram(char a[], char b[]){
   int first[26] = {0}, second[26] = {0}, c=0;
   // Calculating frequency of characters of the first string
   while (a[c] != '\0') {
      first[a[c]-'a']++;
      c++;
   }
   c = 0;
   while (b[c] != '\0') {
      second[b[c]-'a']++;
      c++;
   }
   // Comparing the frequency of characters
   for (c = 0; c < 26; c++)
   if (first[c] != second[c])
      return 0;
      return 1;
}

Run 1:
Enter two strings
abcdef
deabcf
The strings are anagrams.
Run 2:
Enter two strings
tutorials
Point
The strings aren't anagrams.