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<pre>
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <cstring>
#include <string>
#include <cctype>
using namespace std;
void Encrypt(string&);
string Decrypt(string strTarget);
int main(int argc, char* argv[]) {
//initialize and get the string from the user
string strTarget;
cout << "Enter a string to encrypt: ";
//getline(cin,strTarget);
strTarget = argv[1];
string temp(strTarget);
Encrypt(strTarget);
cout << "Encrypted: " << strTarget << endl;
cout << "Decrypted: " << Decrypt(strTarget) << endl;
return 0;
}
void Encrypt(string &strTarget)
{
int len = strTarget.length();
char a;
string strFinal(strTarget);
for (int i = 0; i <= (len-1); i++)
{
a = strTarget.at(i);
int b = (int)a; //get the ASCII value of 'a'
b += 2; //Mulitply the ASCII value by 2
if (b > 254) { b = 254; }
a = (char)b; //Set the new ASCII value back into the char
strFinal.insert(i , 1, a); //Insert the new Character back into the string
}
string strEncrypted(strFinal, 0, len);
strTarget = strEncrypted;
}
string Decrypt(string strTarget)
{
int len = strTarget.length();
char a;
string strFinal(strTarget);
for (int i = 0; i <= (len-1); i++)
{
a = strTarget.at(i);
int b = (int)a;
b -= 2;
a = (char)b;
strFinal.insert(i, 1, a);
}
string strDecrypted(strFinal, 0, len);
return strDecrypted;
}
</pre>
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