How to use prompts with User Defined Functions

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Jason Ramirez
Jason Ramirez 2020-3-6
回答： Sahithi Metpalli 2020-3-9
Help!
So I have been trying to create a user defined function with a prompt as an input so I can data validate a multitude of variables with changing input prompts.
I need it to be silimar to an input function that has one output and one input.
function [Out] = ValidInput('Prompt')
% In is the variable name i want the prompt to have but have no clue to get a value from the prompt.
c = 0;
while In <= 0 & c < 3
% somehow ask again with the same prompt
c = c+1;
end
if In == 0
error('Entered value is zero. Cannot solve problem, program terminated.')
elseif In < 0
warning('Invalid value entered 3 times. Taking the absolute value of the entered value.')
Out = abs(In);
end
end
  1 个评论
Ameer Hamza
Ameer Hamza 2020-3-6
Can you give an example of how you will call this function, and what will be the expected output after running this function?

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回答（1 个）

Sahithi Metpalli
Sahithi Metpalli 2020-3-9
Hi,
Follow the below code
function [Out] = ValidInput(Prompt)
% In is the variable name i want the prompt to have but have no clue to get a value from the prompt.
In = input(Prompt)
c = 0;
while In <= 0 & c < 3
% somehow ask again with the same prompt
In = input(Prompt)
c = c+1;
disp(c);
end
if In == 0
error('Entered value is zero. Cannot solve problem, program terminated.')
elseif In < 0
warning('Invalid value entered 3 times. Taking the absolute value of the entered value.')
Out = abs(In);
else
%assigning In to output
Out = In;
end
end
Call the function in the following way
out = ValidInput("prompt")

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