How can I tell MatLab to give the user a yes or no question?

Here is the first part of my code. The purpose is to find out if the user wants the volume of a pyramid, cone, or torus and to give the formula depending on the inputs. I keep getting an error message that says that Y is undefined so how can I tell MatLab that Y is yes and to continue with the script?

x=input('Do you need the volume of a pyramid?, Y/N'); if x==Y ------------------------------------------------------------ --------b=input('What is the length of the base?');------------------------------------------------------------------------------ ------- h=input('What is the hight?');--------------------------------------------------------------------------------------------- ------- Answer=(1/3)*(b*h);------------------------------------------------------------------------------------------------ ---- -- ------ disp('The area of the pyramid is:')--------------------------------------------------------------------------------- ------ ------ Answer--------------------------------------------------------------------- --------------------------------------------------- ------ end--------------------------------------------------------------------------------------------------------------------------------- ------ if x=='N'------------------------------------------------------------------------------------------------------------------ continue y=input('Do you need the volume of a cone?, Y/N'); if n=='Y'

and it goes on blah blah blah

Answer 1

[Image Analyst]

You can use questdlg() or inputdlg(). Look at the examples in the help.