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

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.

Answer 1

[darova]

Correct way to use logical operators iin your case

[darova]

• I mentioned above - it shows an error

Please show the error

[darova]

you mean msgbox?

[darova]

what about msgbox?

[darova]

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

[darova]

Can you attach the whoel your project?