Invalidate user entry by using isnan or isempty function
3 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Hi,
How do I invalidate a user entry if a positive number is required from the user but the user type a char or negative value.
when a user type a char or negative value,
a prompt will ask the user to reenter again.
% Check for erroneous input and prompt the user to enter option again
while conversion == 0
conv =str2double(conversion);
conversion = input("\nEnter an option. Yes or No \n", 's');
if isempty(conversion)
fprintf("Option Invalid");
conversion = input("\nEnter an option. DR or RD\n", 's');
elseif isnan(conv)
fprintf("Option Invalid");
conversion = input("Enter an option. DR or RD\n", 's');
elseif conv < 0
fprintf("Option Invalid");
conversion = input("Enter an option. DR or RD\n", 's');
end
end
0 Kommentare
Antworten (1)
Jorg Woehl
am 8 Mär. 2021
Bearbeitet: Jorg Woehl
am 10 Mär. 2021
str2double returns NaN (not-a-number) when it cannot convert text to a number. You can therefore simply use isnan to test if a number has been entered, and combine that with a x>0 check:
str = input('Enter an option: ', 's');
x = str2double(str);
while isnan(x) || ~(x>0)
str = input('Invalid input. Enter an option: ', 's');
x = str2double(str);
end
0 Kommentare
Siehe auch
Kategorien
Mehr zu Numeric Types finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!