/*
 * This is a header file that includes a translator class whose main use of this funtion will be to 
 * translate strings of letters into strings of numbers that can be encoded, and transferign these 
 * encoded strings of numbers back to strings of letters. The strings used here are from the C++
 * string class and not C style strings since the former are easier to use. Also, note that the 
 * letters and numbers are in correspondence according to the letters place in the alphabet with 
 * startin at 0. Thus a <-> 0, b <-> 1, ..., z <-> 25, which is similar to the correspondence from 
 * your cryptology reading except that the indexing starts at 0 to correspond to C++ array 
 * indexing. Note that, as in the cryptology readings, only lower case letters are used, and the 
 * strings must contain no spaces or punctuation to be translated properly.
 *
 */

//Note the #include<string> declaration, which is necessary to use the string class. 
#include <iostream>
#include <string>
using namespace std;
 
//Declares the Translator class.
class Translator {
private:
	//Variable that will hold the string that we use for translation.
	string tran;

public:
	Translator() {tran = "abcdefghijklmnopqrstuvwxyz";}
	void string_to_num(string *str, int *arr, int n);
	void num_to_string(string *str, int *arr, int n);

}; 
 
void Translator::string_to_num(string *str, int *arr, int n) {
	
	for(int i = 0; i < n; i++) {
		for(int j = 0; j < 26; j++) {
			if(tran[j] == (*str)[i]) {
				arr[i] = j;
				break;
			}
		}
	}
}

void Translator::num_to_string(string *str, int *arr, int n) {

	for(int i = 0; i < n; i++) {
		(*str)[i] = tran[*arr];
		arr++;
	}
}