Anagram.h

#ifndef ANAGRAM_H
#define ANAGRAM_H
#include <string>
#define NO_OF_CHARS 256
using namespace std;

bool isAnagram (const string& a, const string& b) {
    int count[NO_OF_CHARS] = {0};
    int i;
 
    for (i = 0; a[i] && b[i];  i++)
    {
        count[a[i]]++;
        count[b[i]]--;
    }
 
    if (a[i] || b[i])
      return false;

    for (i = 0; i < NO_OF_CHARS; i++)
        if (count[i])
            return false;
     return true;
}

#endif

main.cpp

#include "Anagram.h"
#include <iostream>
#include <string>
using namespace std;

int main () {
	string a, b;

	printf("Enter a string 'a': ");
	cin >> a;
	printf("Enter a string 'b': ");
	cin >> b;

	// test if they are anagrams
	if (isAnagram(a, b))
		cout << a << " and " << b << " are anagrams." << endl;
	else
		cout << a << " and " << b << " are not anagrams." << endl;
}