MATLAB: How do l let the user re-enter input if the original input is unacceptable

MATLABuser input

Everything works so far but I want to make my code so that the user can reenter the grade if he/she enters a grade too high or too low the first time. Here is my code so far:
HW_Grades = []
for jj = 1:4
    HW_Prompt = input('What are your grades on your 1st-4th HW assignments? (Enter a number between 5 and 15, then press enter, and repeat);   ');
    if  (HW_Prompt < 5);
        disp('Your grade is too low');
    end
    if  (HW_Prompt  > 15);
        disp('Your grade is too high');
    end
HW_Grades(jj) = HW_Prompt;
end
HW_Total = sum(HW_Grades)

Best Answer

Use a while loop. Try this:
HW_Grades = [0,0,0,0]; % Initialize
for jj = 1 : 4
	gradeOK = false;
	while ~gradeOK  % Keep looping and asking until the grade is OK
		userPrompt = sprintf('What is your grade on HW assignment %d?\n (Enter a number between 5 and 15, inclusive, then press enter, and repeat);   ', jj);
		userResponse = input(userPrompt);
		if userResponse < 5
			uiwait(warndlg('Your grade is too low'));
		elseif userResponse > 15
			uiwait(warndlg('Your grade is too high'));
		else
			HW_Grades(jj) = userResponse;
			gradeOK = true;
		end
	end
end
HW_Total = sum(HW_Grades)
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