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Basic Function that Prompts User and then Calculates Accordingly

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shiffraw dagnechaw
shiffraw dagnechaw 2018-8-22
回答： Image Analyst 2018-8-24
I'm trying to create a function that gives the user a prompt box that asks the user to choose subtraction or division. This is just a very basic version of what I'm trying to do. I'll paste my code below.
function[result1] = calculate1(x,y)
z = inputdlg({'Subtraction or Division'})
if z == 'subtraction'
x + 1
else
y + 1
end
end
  2 个评论
Rik
Rik 2018-8-22
Your output is not defined in this function, and you are using == instead of strcmp, which will likely result in unintended behavior.
Wycliff Dembe
Wycliff Dembe 2018-8-24
In addition to using strcmp and defining result1 in the function you can also consider abstracting the input if there are only two or few input choices by creating question dialog box to avoid the case sensitivity and other user input errors. Ref: https://www.mathworks.com/help/matlab/ref/questdlg.html

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回答（2 个）

Walter Roberson
Walter Roberson 2018-8-24
inputdlg() returns a cell array of character vectors.
z = inputdlg({'Subtraction or Division'});
if strcmpi(z{1}, 'subtraction')
...
end
You should also consider using menu()
  1 个评论
Steven Lord
Steven Lord 2018-8-24
I second Walter's recommendation to use menu. If you must use inputdlg instead of menu (you're trying to complete a homework assignment that specifically instructs you to use inputdlg, for example) I recommend using a switch statement instead of an if statement. See the first example on the switch documentation page for a demonstration of switch, case, and otherwise.

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Image Analyst
Image Analyst 2018-8-24
Use questdlg():
promptMessage = sprintf('What do you want to do?');
titleBarCaption = 'Which Operation?';
buttonText = questdlg(promptMessage, titleBarCaption, 'Subtraction', 'Division', 'Quit', 'Subtraction');
if contains(buttonText, 'Quit')
% Bail out.
return;
elseif contains(buttonText, 'Subtraction')
% Do your subtraction code.
else
% Addition code...
end

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