MATLAB: SWITCH expression must be a scalar or a character vector. issue

inputdlgMATLAB

Hi im trying to calculate price of 1,2,3 or more glass of milk. 1 glass of milk must be 1.75$ 2 is 3.0$ 3 is 3.5$ and for more glass 3.5$ + 0.5+ for every glass, but i am getting this error "SWITCH expression must be a scalar or a character vector". Any idea ? i check forum before but answer i get dont solve my problem thx for any help. Btw my proffesor only accept the homework if i use "inputdlg" "msgbox(sprintf(", and switch case stracture.
box=inputdlg('how many glass of milk');
switch box
    case '1'
        price=1.75;
    case '2'
        price=3;
    case '3'
        price=3.5;
    otherwise
        price=3.5+(0.5)*x;
end
msgbox(sprintf('you must pay %f',price));

Best Answer

inputdls is returning a cell, and also the variable x is not defined. Then you need to do something like this:
box=inputdlg('how many glass of milk');
switch box{1}
    case '1'
        price=1.75;
    case '2'
        price=3;
    case '3'
        price=3.5;
    otherwise
        price=3.5+(0.5)*str2double(box{1});
end
msgbox(sprintf('you must pay %f',price));
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