#include <iostream>
#include <cstdlib>
#include <cassert>
#include <fstream>

using namespace std;
const unsigned int R = 15; //random nummer


void encryption(char& a, unsigned int ri)
{
 //precondtition
assert(true);
//postcondition char a is encryptided
if (a >= 32)
a=(a-32+(ri%(128-32)))%(128-32)+32;
else if (a == 10)
a='\n';
else
a=a;


}

void dencryption(char& a, unsigned int ri)
{
 //precondtition
assert(true);
//postcondition char a is encryptided
if (a >= 32)
a= (a - (ri % (128 - 32)) + 64) % (128 - 32) + 32;
else if (a == 10)
a='\n';
else
a=a;
}


int main()
{
 srand(R);
 cout <<"to encryp the text press number" <<endl;
 int number;
 cin >> number;
 ifstream text("test.txt");
 ofstream code("CodeTest.txt");
    if (text)
    {
        while(text)
        {
            char a;
            text.get(a);
            encryption(a,rand());
            cout << a ;
            code.put(a);
        }
    }
    else
        cout<<"Text could not be opend/n" <<endl;
 text.close();
 code.close();

 cout<<"To decode Text press number\n";
 cin>>number;
 ifstream decode("CodeTest.txt");
 ofstream newcode("NewTest.txt");
 if (decode)
    {
        while(decode)
        {
            char a;
            decode.get(a);
            dencryption(a,rand());
            cout << a ;
            newcode.put(a);                     //put decoded character in the textfile
        }
    }
    else
        cout<<"Text could not be opend" <<endl;  //there is no text that can be decoded
 decode.close();
 newcode.close();
}