Putting a password on the prog

**Inferno** · 09-15-2004

ok Thanks Salem.... Also I have one more question about the Password for any of you.

Code:

#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
  char Password[100] 
  cout<<"Please enter the 3 digit password";
  cin>>Password;
  if ( Password == 123 )
  cout<<"You've enter the correct password Congratulation!";
  
  system("PAUSE");	
  return 0;
}

There is nothing saying nething about a password in this which causes the the code when compiled to give an error. So anyway what I was wondering is what am I supposed to put the PW "123" as i tried putting it as int 123 up near the char but that didnt work(I only assumed i should do this becuase i thought it might need somewhere to start to actually run in the program)

**Sebastiani** · 09-15-2004

>> if ( Password == 123 )

c'mon now, you know you can't compare a char array like that! use strcmp() with char array (not int!) parameters. std::strings do have an overloaded operator == though, so you can use one like this:

>> if ( Password == "123" )

**toysoldier** · 09-15-2004

@Inferno & Sebastiani :

haha, it's running ok after make a little correction!

Code:

#include <iostream>
#include <cstring>   //add this for use string type

using namespace std;

int main(int argc, char *argv[])
{
  char Password[100];          //add ';' 

  cout<<"Please enter the 3 digit password: ";
  cin>>Password;
  
  if ((string) Password == "123" )  //converter array to string type
  cout<<"\nYou've enter the correct password Congratulation!";
  
  cout<<endl<<endl;
  system("PAUSE");  
  return 0;
}

**jlou** · 09-15-2004

Try this... much better than your attempt to cast to a string type (the proper string header is <string>).

Code:

#include <iostream>
#include <string>   //add this for use string type

using namespace std;

int main(int argc, char *argv[])
{
  string Password;

  cout<<"Please enter the 3 digit password: ";
  cin>>Password;
  
  if (Password == "123")
    cout<<"\nYou've enter the correct password Congratulations!";
  
  cout<<endl<<endl;
  system("PAUSE");  
  return 0;
}

**toysoldier** · 09-16-2004

@ jlou :

Thanks for your help, I always think <cstring> is right head for string,
now I know <string> is alright.

**Inferno** · 09-16-2004

Thanks very much all of you for your help

**phoenixodin2** · 09-18-2004

Try to use my optimize version.
It is likely C version, but anyway more optimize about space and memory.

Regards.

Now I've fixed event when input data buffer longer than expected.

Thanks.
Regards.

Code:

#include <iostream>

using namespace std;
char def_pass[]="iloveyou";

int main()
{
		static int i =	strlen(def_pass)+1;
		char* pPassword = new char[i];
		cout << "Please enter the password:\n";
		//cin  >> pPassword; // ok, maybe error
		fgets (&pPassword[0], i, stdin) ;  // replacement		
if (strcmp(pPassword,def_pass)!=0)
			{
			cerr << "Incorrect password.";
			return 1;// exit program with error code = 1
			}	
		cout << "Correct password.";
		delete pPassword;
		//
		//program begin here!

		//
		return 0;
}

**CornedBee** · 09-18-2004

This may crash if the password entered is longer than the real one.

**phoenixodin2** · 09-18-2004

thanks, CornedBee

I've fixed.

You see?

It is OK, now?

**CornedBee** · 09-18-2004

Well, it's one way to do it.

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Try my optimize version. Fixed

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