Proposed exercise
Create a class "Encrypter" to encrypt and decrypt text.
It will have a "Encrypt" method, which will receive a string and return another string. It will be a static method, so that we do not need to create any object of type "Encrypter".
There will be also a "Decrypt" method.
In this first approach, the encryption method will be a very simple one: to encrypt we will add 1 to each character, so that "Hola" would become "Ipmb", and to decrypt we would subtract 1 to each character.
An example of use might be
string newText = Encrypter.Encrypt("Hola");
Output
Solution
using System;
namespace Program
{
class Encrypter
{
public static string Encrypt(string text)
{
int letterInt = 0;
char letter = ' ';
string textEncripted = "";
for (int i = 0; i < text.Length; i++)
{
letterInt = (int)text[i] + 1;
letter = (char)letterInt;
textEncripted += letter.ToString();
}
return textEncripted;
}
public static string Decrypt(string text)
{
int letterInt = 0;
char letter = ' ';
string textDecripted = "";
for (int i = 0; i < text.Length; i++)
{
letterInt = (int)text[i] - 1;
letter = (char)letterInt;
textDecripted += letter.ToString();
}
return textDecripted;
}
}
class TextEncripted
{
static void Main()
{
bool debug = true;
string newText = Encrypter.Encrypt("Hola");
Console.WriteLine("Text encripted: {0}", newText);
string TextDescripted = Encrypter.Decrypt(newText);
Console.WriteLine("Text Decripted: {0}", TextDescripted);
if (debug)
Console.ReadLine();
}
}
}