C Program - Anagrams

#include <stdio.h>
#include <conio.h>

int check_anagram(char [], char []);

int main()
{
    char a[100], b[100];
    int flag;

    printf("Enter first string\n");
    gets(a);

    printf("Enter second string\n");
    gets(b);

    flag = check_anagram(a, b);

    if (flag == 1)
        printf("\"%s\" and \"%s\" are anagrams.\n", a, b);
    else
        printf("\"%s\" and \"%s\" are not anagrams.\n", a, b);
        getch();

    return 0;
}

int check_anagram(char a[], char b[])
{
    int first[26] = {0}, second[26] = {0}, c = 0;

    while (a[c] != '\0')
    {
        first[a[c]-'a']++;
        c++;
    }

    c = 0;

    while (b[c] != '\0')
    {
        second[b[c]-'a']++;
        c++;
    }

    for (c = 0; c < 26; c++)
    {
        if (first[c] != second[c])
            return 0;
    }
    return 1;
}

Output
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