How can I use a 'While Loop' to verify user input where it restricts specific inputs?

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Miss B
Miss B 2020-3-25
评论： darova 2020-3-25
Hi Everyone!
I'm somewhat new to Matlab - a little trail and error phase.
I've been trying to use a 'While Loop' to verify an input. This issue may seem quite easy to most, but it's been playing
with my head for so long!
Here's the given situation; I just want to check when a user enters an input - there's should be a restriction, also a msg pop-up reassuring them to try again.
Here's my examples below for TWO different text input:
1. function percentageinput_Callback(~, ~, ~)
inputnum=input ('Enter a percentage from 0-100: ');
while inputnum>0% && <=100%
fprintf('You entered a %d. |n|n, inputnum)
inputnum=input ('Enter a percentage from 0%-100%:');
end
For the above secenrio, as you may tell I want the user to only enter a percentage from 0% - 100% - also showing the
percentage sign.
2. function markinput_Callback(~, ~, ~)
inputnum=input ('Enter a makr from 0-100: ');
while inputnum>0 && <=100
fprintf('You entered a %d. |n|n, inputnum)
inputnum=input ('Enter a mark from 0-100:');
end
For the above, the same rule applies but I want to restrict the user from entering character/string and negative number.
Any help will be appreciated!
Thank you.

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回答（1 个）

darova
darova 2020-3-25
Correct way to use logical operators iin your case
  5 个评论
显示 3更早的评论
darova
darova 2020-3-25
try this
function in1_Callback(~, ~, ~)
str = get (handled.in1,'string');
inputnum = str2double(str);
if inputnum <0 || inputnum >100
s = sprintf('You entered a %d.\nPlease Enter 0 .. 100', inputnum);
msgbox(s)
end

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