string together letters for encryption..

[dahui10]

there is a certain command if I remember correctly to imput multiple letters like if I say "hello" it will encrypt "hello" not just the "h" thats what I'm stuck doing right now here is my code. I know its something simple I just can't think of it.. this is supposed to be a very simple cipher so I'd like to keep the program the same. thanks for the help I'll keep digging.

#include <iostream>
#include <iomanip>
#include <stdlib.h>

using namespace std;

char encrypt(char);
int encrypt(int);
double encrypt(double);
char decrypt(char);
int decrypt(int);
double decrypt(double);
void perform();     


int main()
      {
      perform();   
      return 0;
      }

//Cliff
void perform()
      {
      char character;
      char decryptchoice = '1';
      char encryptchoice = '1';
      string choice;
      int integer;
      double real;
      cout << "\nWelcome to our encryption program\n" << endl;
      cout << fixed << showpoint;
      cout << setprecision(2); 


      {            
      cout << "Please 1 to Encrypt." << endl;
      cout << "Please 2 to Decrypt." << endl;
      cout << "Please 9 to Exit.\n" << endl;
      cout << "Press 1, 2 or 9: ";      
      cin >> choice;
      system("CLS");
      
      if (choice == "1")      
      {
      goto choice1;
      } 
      
      if (choice == "2")      
      {
      goto choice2;
      }
      if (choice == "9")
      {
      goto choice9;
      } 
      
      if (choice != "1")
      if (choice != "2")
      if (choice != "9")
      {
      cout << "Please choose 1, 2 or 9 ." << endl;
      system("PAUSE");
      system("CLS");
      return perform();
      } 

      //Charlie
      choice1:
      cout << "\nEncryption Menu" << endl;                 
      cout << "\nPlease 1 to encrypt a character." << endl;
      cout << "Please 2 to encrypt an integer." << endl;
      cout << "Please 3 to encrypt a real number." << endl;
      cout << "Please 9 to exit.\n" << endl;
      cout << "Press 1, 2, 3 or 9: ";   
      cin >> encryptchoice;              
                        }
                    
                    
      switch (encryptchoice)
      {
      case '1':
      cout << "Enter a character to encrypt: ";
      cin >> character;
      cout << "The encrypted character is " << encrypt (character) << endl;
      system("PAUSE");
      goto choice9;
      break;
      case '2':
      cout << "Enter an integer to encrypt: ";
      cin >> integer;
      cout << "The encrypted number is " << encrypt (integer) << endl;
      system("PAUSE");
      goto choice9;
      break;
      case '3':
      cout << "Enter a real number to encrypt: ";
      cin >> real;
      cout << "The encrypted number is " << encrypt (real)  << endl;
      system("PAUSE");
      goto choice9;
      break;
      case '9':
      cout << "Thank you for using the encryption program." << endl;
      system("PAUSE");
      goto choice9;
      break;
      default:
      cout << "Invalid choice." << endl;
      system("PAUSE");
      goto choice9;
      break;
 
      //TJ
      choice2:
      cout << "\nDecryption Menu" << endl;
      cout << "\nPlease 1 to decrypt a character." << endl;
      cout << "Please 2 to decrypt an integer." << endl;
      cout << "Please 3 to decrypt a real number." << endl;
      cout << "Please 9 to exit.\n" << endl;
      cout << "Press 1, 2, 3 or 9: ";   
      cin >> decryptchoice;  
      }
      
      switch (decryptchoice)    
      {  
      case '1':
      cout << "Enter a character to decrypt: ";
      cin >> character;
      cout << "The decrypted character is " << decrypt (character) << endl;
      system("PAUSE");
      break;
      case '2':
      cout << "Enter an integer to decrypt: ";
      cin >> integer;
      cout << "The decrypted number is " << decrypt (integer) << endl;
      system("PAUSE");
      break;
      case '3':
      cout << "Enter a real number to decrypt: ";
      cin >> real;
      cout << "The decrypted number is " << decrypt (real) << endl;
      system("PAUSE");
      break;
      case '9':
      cout << "Thank you for using the decryption program." << endl;
      default:
      cout << "Invalid choice." << endl;
      system("PAUSE");
      break;
      }

      choice9:
      cout << "\nThank you for using the encryption program." << endl;
      system("PAUSE");
      system("EXIT");
      }                     
//Cliff
char encrypt (char character)
{
    return character + 4;
}
//Charlie
int encrypt (int integer)
{
    return integer + 4;

}
//TJ
double encrypt (double real)
{
    return real + 4;

}
//Cliff
char decrypt (char character)
{
    return character - 4;
}
//Charlie
int decrypt (int integer)
{
    return integer - 4;
}
//TJ
double decrypt (double real)
{
    return real - 4;
}