how do i prompt a prompt

I'm writing a code to do a calculation. after the user puts in the number I want the next line of code to ask the user is it in inches or centimeters.

Answer 1

[Walter Roberson]

consider using menu()

But if not then

whichunits = input('Inches (i) or centimeters (c)? ', 's');
if strncmpi(whichunits, 'i', 1)
  whichunits = 'i';
elseif strncmpi(whichunits, 'c', 1)
  whichunits = 'c';
else
  warning('I did not understand that answer. Assuming inches');
  whichunits = 'i';
end

Answer 2

[Image Analyst]

Try this:

promptMessage = sprintf('Are the units inches or centimeters?');
titleBarCaption = 'Define Units';
buttonText = questdlg(promptMessage, titleBarCaption, 'in', 'cm', 'Cancel', 'in');
if strcmpi(buttonText, 'Cancel')
  % User clicked cancel - they want to bail out
  units = ''
  return;
elseif strcmpi(buttonText, 'cm')
  % User clicked cm.  Assign a variable called "units".
  units = 'cm'
else
  % User clicked in.  Assign a variable called "units".
  units = 'in'
end