Question

Write an encryption and decryption program that displays properly in Microsoft Visual Studio using c++. Encrypt each digit by adding 7 and taking the remainder after division by 10. After encrypting each digit, swap the first and third then swap the second and fourth. Decryption should reverse the process. Program must input a single integer. Program must do encode and decode in one file.

        Example Program Session (yours must look like this):

Encode (1) Decode (2): 1
Enter a four digit number: 1234
Encoded Digits: 0189
Continue (1) Exit (0): 1
Encode (1) Decode (2): 2
Enter a four digit number: 0189
Decoded Digits: 1234
Continue (1) Exit (0): 0

For whatever reason, I cannot get my code to run properly. When I enter my numbers (1234), nothing appears afterwards. Your help is greatly appreciated!

Screenshots of how it looks on your screen would be greatly appreciated.

Answer 1

`Hey,

Note: Brother if you have any queries related the answer please do comment. I would be very happy to resolve all your queries.

/******************************************************************************

Online C++ Compiler.
Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.

*******************************************************************************/

#include <iostream>
#include<cstdlib>
using namespace std;

int main(void)
{
int encrypt;
int decrypt;
int e1, e2, e3, e4;
int d1, d2, d3, d4;
int a, x;
int o, d, t, q;
  
  
do
{
cout<<("Encode (1)\t Decode (2): \n" );
cin>>a;
  
if(a==1)
{
cout<<("Enter four digit number: \n");
cin>>x;
q = x % 10;
x /= 10;
t = x % 10;
x /= 10;
d = x % 10;
x /= 10;
o = x % 10;
  
e1 = (o + 7) %10;
e2 = (d + 7) %10;
e3 = (t + 7) %10;
e4 = (q + 7) %10;
  
encrypt = (e3*1000) + (e4*100) + (e1*10) + e2;
  
  
  
cout<<"Encoded Digits: 0"<<encrypt<<endl;
}
else if (a == 2)
{
cout<<("Enter four digit number: \n");
cin>>x;
q = x % 10;
x /= 10;
t = x % 10;
x /= 10;
d = x % 10;
x /= 10;
o = x % 10;
  
d1 = (o +3)%10; //+3 = -7 +10 (in case -7 gives a negative
d2 = (d +3)%10;
d3 = (t +3)%10;
d4 = (q +3)%10;

decrypt = (d3*1000) + (d4*100) + (d1*10) + d2;
  
cout<<"Decoded Digits: "<<decrypt<<endl;
}
else
{
cout<<("Encode (1)\t Decode (2): \n" );
cin>>a;
}
  
cout<<("Continue (1)\t Exit (0): ");
cin>>a;
}while(a==1);
return 0;
  
}
  
  

Kindly revert for any queries

Thanks.