encrypt(암호화) 프로그래밍 c++

단순 문자열을 암호화 하기 : 

//

//  main.cpp

//  encrypt

//

//  Created by Gavin on 2013. 11. 29..

//  Copyright (c) 2013년 Gavin. All rights reserved.

//

#include <iostream>

using std::cout;

using std::endl;

void encrypt(char[]);

void decrypt(char * ePtr);

int main(int argc, const char * argv[])

{

    // create a string to encrypt

    char string[ ] = "this is a secret!";

    cout << "Original string is: " << string << endl;

    encrypt( string );

    // call to the function encrypt( )

    cout << "Encrypted string is: " << string << endl;

    decrypt( string );

    // call to the function decrypt( )

    cout << "Decrypted string is: " << string << endl;

    

       return 0;

}

//encrypt data

void encrypt (char e[] )

{

    for( int i=0; e[i] != '\0'; ++i ) ++e[i];

} // encrypt

//decrypt data

void decrypt( char * ePtr ) {

    for( ; * ePtr != '\0'; ++* ePtr ) --(* ePtr);

}