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May 3rd, 2009

how to loop in switch??

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how im gonna loop menu if option not 1 or 2 ???

C++ Syntax (Toggle Plain Text)
void display( )
{  
	int option;
	system("cls"); //clear screen
	cout<<endl<<endl;
	cout<<"\t  * Display Menu *\n";
	cout<<"\n\t1. Display For Certein Date"<<endl; 
	cout<<"\t2. Display All Appointments"<<endl;
	cout<<"\nEnter Option Number: ";  //Enter option
	cin>>option;
	cin.get();
 
	switch ( option ) 
	  {
		 case 1: displayCerteinDate ( );
			     break;
		 case 2: displayAll ( );
		             break;
	     default: cout<<endl<<"Wrong option number!! Try again\n";
	              cin.get();         //give the user a chance to read the output data
	  }
}
void display( )
{  
	int option;
	system("cls"); //clear screen
	cout<<endl<<endl;
	cout<<"\t  * Display Menu *\n";
	cout<<"\n\t1. Display For Certein Date"<<endl; 
	cout<<"\t2. Display All Appointments"<<endl;
	cout<<"\nEnter Option Number: ";  //Enter option
	cin>>option;
	cin.get();

	switch ( option ) 
	  {
		 case 1: displayCerteinDate ( );
			     break;
		 case 2: displayAll ( );
		             break;
	     default: cout<<endl<<"Wrong option number!! Try again\n";
	              cin.get();         //give the user a chance to read the output data
	  }
}

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May 3rd, 2009

Re: how to loop in switch??

Put

C++ Syntax (Toggle Plain Text)
cout<<endl<<"Wrong option number!! Try again\n";
cin.get(); //give the user a chance to read the output data
cout<<endl<<"Wrong option number!! Try again\n";
cin.get(); //give the user a chance to read the output data

in a do-while -loop and change cin.get(); to cin>>option; like this:

C++ Syntax (Toggle Plain Text)
do {
    cout<<endl<<"Wrong option number!! Try again\n";
    cin>>option;
} while(option<1 || option>2);
do {
    cout<<endl<<"Wrong option number!! Try again\n";
    cin>>option;
} while(option<1 || option>2);

Last edited by tux4life; May 3rd, 2009 at 6:49 am.

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May 3rd, 2009

Re: how to loop in switch??

C++ Syntax (Toggle Plain Text)
while ( cin>>option ) {
    switch ( option )
    {
    }
}
while ( cin>>option ) {
    switch ( option )
    {
    }
}

Salem

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May 3rd, 2009

Re: how to loop in switch??

Click to Expand / Collapse Quote originally posted by Salem ...

C++ Syntax (Toggle Plain Text)
while ( cin>>option ) {
    switch ( option )
    {
    }
}
while ( cin>>option ) { switch ( option ) { } }

You have to take into account that the loop won't end automatically except if the user enters some text ...

Last edited by tux4life; May 3rd, 2009 at 7:09 am.

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May 3rd, 2009

-1

Re: how to loop in switch??

actually u can use a flag......(its just a variable but commonly know as flag when used in such purposes )

C++ Syntax (Toggle Plain Text)
 
void display( )
{  
	int option, int flag =1;
	system("cls"); //clear screen
	cout<<endl<<endl;
	cout<<"\t  * Display Menu *\n";
	cout<<"\n\t1. Display For Certein Date"<<endl; 
	cout<<"\t2. Display All Appointments"<<endl;
	cout<<"\t3.  exit"<<endl;
	cout<<"\nEnter Option Number: ";  //Enter option
	cin>>option;
	cin.get();
    while(flag)
	{   
        switch ( option ) 
        {
            case 1: displayCerteinDate ( );
                    break;
            case 2: displayAll ( );
		             break;
            case 3: flag =0;
                     break;
            default: cout<<endl<<"Wrong option number!! Try again\n";
                    cin.get();         //give the user a chance to read the output data
	  }
	}
 
}
void display( )
{  
	int option, int flag =1;
	system("cls"); //clear screen
	cout<<endl<<endl;
	cout<<"\t  * Display Menu *\n";
	cout<<"\n\t1. Display For Certein Date"<<endl; 
	cout<<"\t2. Display All Appointments"<<endl;
	cout<<"\t3.  exit"<<endl;
	cout<<"\nEnter Option Number: ";  //Enter option
	cin>>option;
	cin.get();
    while(flag)
	{   
        switch ( option ) 
        {
            case 1: displayCerteinDate ( );
                    break;
            case 2: displayAll ( );
		             break;
            case 3: flag =0;
                     break;
            default: cout<<endl<<"Wrong option number!! Try again\n";
                    cin.get();         //give the user a chance to read the output data
	  }
	}

}

i have intialised a variable flag to 1 . and put the whole swicth inside a while loop which check for the status of the flag.
i have included an exit option in the menu . so as soon as the user presses 3. the flag =0 and the while condition fails , eventually u will come out of the loop and program ends

Last edited by rahul8590; May 3rd, 2009 at 6:57 am.

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May 3rd, 2009

Re: how to loop in switch??

Click to Expand / Collapse Quote originally posted by rahul8590 ...

actually u can use a flag......(its just a variable but commonly know as flag when used in such purposes )

Why the h*ll would you use an integer flag? Isn't boolean good enough here ?

Last edited by tux4life; May 3rd, 2009 at 7:12 am.

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May 3rd, 2009

Re: how to loop in switch??

flag is a variable name .. u can also write ur name instead of that.. its just that i am a bit convenient with that name that's its.....
and i am also giving an option in switch case if the user wants to exit.
both the way it works.....

Last edited by rahul8590; May 3rd, 2009 at 7:03 am.

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May 3rd, 2009

Re: how to loop in switch??

Click to Expand / Collapse Quote originally posted by rahul8590 ...

flag is a variable name .. u can also write ur name instead of that.. its just that i am a bit convenient with that name that's its.....

I know flag is a variable name, but two things, if you would have to use a flag in this case you should have used a boolean instead of an integer and here it's just overkill, why would you use an integer flag here?

Last edited by tux4life; May 3rd, 2009 at 7:10 am.

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May 3rd, 2009

Re: how to loop in switch??

i guess u didnt understand my code..... why dont you execute this code and see how exactly it works.......
and variable can also be put inside instead of boolean, any way 1= TRUE and and 0 or lesser implies false.......

and if you have observed the original code.. it doesnt have ne room for allowing the user to exit..
if he./she presses the wrong number , its just wants to accept the new number .. so where the h@#l the user will exit............

Last edited by rahul8590; May 3rd, 2009 at 7:07 am.

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May 3rd, 2009

Re: how to loop in switch??

Click to Expand / Collapse Quote originally posted by rahul8590 ...

i guess u didnt understand my code..... why dont you execute this code and see how exactly it works.......
and variable can also be put inside instead of boolean, any way 1= TRUE and and 0 or lesser implies false.......

I know, you don't have to teach me C++, but a boolean takes up less memory

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