DECAESAR.H

#ifndef DECAESAR_H    // To make sure you don't declare the function more than once by including the header multiple times.
#define DECAESAR_H

#include<iostream>
#include<fstream>
#include<cctype>

using namespace std;

void DeCaesar(char file1[20],char file2[20])
{

    ifstream infile;
    ofstream outfile;

    int n;
    cout << "\nEnter the rot\n";
    cin >> n;

    infile.open (file1);   //opens the file to be encrypted
    outfile.open (file2); //opens the output file

    char c;

    while (!infile.eof()) {	//while not the end of the file
    
        infile >> c;
        
		c -= n;

        if (c < 'a')
            c += 26;

        outfile << c;

    }

    outfile << "\n\n"; //aesthetic purposes

    infile.close();	 //closes the original file
    outfile.close();	//closes the file encryption

}

#endif