What wrong with this?

clear ;

clc;

velocity = str2double(input('Enter your constant velocity for v: '));

while isnan(velocity) % If your input is not a number

velocity = str2double(input('Your value is not a number.Please input your velocity for v:','s')); % Enter new input for c

end

while velocity == 0

disp('Your velocity must not be zero');

velocity = str2double(input('Enter enter true value of constant velocity for v: '));

while isnan(velocity) % If your input is not a number

velocity = str2double(input('Your value is not a number.Please input your velocity for v:','s')); % Enter new input for c

end

end

Height = str2double(input('Enter your height to explorers for H: '));

while isnan(Height) % If your input is not a number

Height = str2double(input('Your value is not a number.Please input your height for H:','s')); % Enter new input for c

end

while Height == 0

disp('Your height must not be zero');

Height = str2double(input('Enter true value of height for H: '));

while isnan(Height) % If your input is not a number

Height = str2double(input('Your value is not a number.Please input your height for H:','s')); % Enter new input for c

end

end

v = velocity;

H = Height;

disp(' g is a gravitational acceleration which is 9.81 m/s');

g = 9.81;

t = sqrt((2*H)/g);

disp(t);

S =v*t;

disp(S);

Answer 1

[Stijn Haenen]

you dont need 'str2double' if you ask for an input which should be a number