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how to loop in switch??

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how to loop in switch??

 
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  #1
May 3rd, 2009
how im gonna loop menu if option not 1 or 2 ???
C++ Syntax (Toggle Plain Text) 
  1. void display( )
  2. {  
  3. 	int option;
  4. 	system("cls"); //clear screen
  5. 	cout<<endl<<endl;
  6. 	cout<<"\t  * Display Menu *\n";
  7. 	cout<<"\n\t1. Display For Certein Date"<<endl; 
  8. 	cout<<"\t2. Display All Appointments"<<endl;
  9. 	cout<<"\nEnter Option Number: ";  //Enter option
  10. 	cin>>option;
  11. 	cin.get();
  12.  
  13. 	switch ( option ) 
  14. 	  {
  15. 		 case 1: displayCerteinDate ( );
  16. 			     break;
  17. 		 case 2: displayAll ( );
  18. 		             break;
  19. 	     default: cout<<endl<<"Wrong option number!! Try again\n";
  20. 	              cin.get();         //give the user a chance to read the output data
  21. 	  }
  22. }
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Re: how to loop in switch??

 
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  #2
May 3rd, 2009
Put
C++ Syntax (Toggle Plain Text) 
  1. cout<<endl<<"Wrong option number!! Try again\n";
  2. 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) 
  1. do {
  2.     cout<<endl<<"Wrong option number!! Try again\n";
  3.     cin>>option;
  4. } while(option<1 || option>2);
Last edited by tux4life; May 3rd, 2009 at 6:49 am.
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Re: how to loop in switch??

 
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  #3
May 3rd, 2009
C++ Syntax (Toggle Plain Text) 
  1. while ( cin>>option ) {
  2.     switch ( option )
  3.     {
  4.     }
  5. }
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Re: how to loop in switch??

 
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  #4
May 3rd, 2009
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Originally Posted by Salem View Post
C++ Syntax (Toggle Plain Text) 
  1. while ( cin>>option ) {
  2.     switch ( option )
  3.     {
  4.     }
  5. }
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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Re: how to loop in switch??

 
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  #5
May 3rd, 2009
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) 
  1.  
  2. void display( )
  3. {  
  4. 	int option, int flag =1;
  5. 	system("cls"); //clear screen
  6. 	cout<<endl<<endl;
  7. 	cout<<"\t  * Display Menu *\n";
  8. 	cout<<"\n\t1. Display For Certein Date"<<endl; 
  9. 	cout<<"\t2. Display All Appointments"<<endl;
  10. 	cout<<"\t3.  exit"<<endl;
  11. 	cout<<"\nEnter Option Number: ";  //Enter option
  12. 	cin>>option;
  13. 	cin.get();
  14.     while(flag)
  15. 	{   
  16.         switch ( option ) 
  17.         {
  18.             case 1: displayCerteinDate ( );
  19.                     break;
  20.             case 2: displayAll ( );
  21. 		             break;
  22.             case 3: flag =0;
  23.                      break;
  24.             default: cout<<endl<<"Wrong option number!! Try again\n";
  25.                     cin.get();         //give the user a chance to read the output data
  26. 	  }
  27. 	}
  28.  
  29. }


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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Re: how to loop in switch??

 
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  #6
May 3rd, 2009
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Originally Posted by rahul8590 View Post
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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Re: how to loop in switch??

 
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  #7
May 3rd, 2009
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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Re: how to loop in switch??

 
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May 3rd, 2009
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Originally Posted by rahul8590 View Post
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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Re: how to loop in switch??

 
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  #9
May 3rd, 2009
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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Re: how to loop in switch??

 
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May 3rd, 2009
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Originally Posted by rahul8590 View Post
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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