decimal place and ans problem

So i have write a script but i still have 2 problems; *First one is that the result shuld be shown with 5 numbers after coma and i have no idea how to to this. *The second one is with ans, i got it twice after running my script and i got no idea why, can someone expalin me why did i get this and how to get rid out of it?

Here is my script:

clc

disp('Program liczący miejsca zerowe funkcji kwadratowej - Daniel Siwiec')

disp('ax^2+bx+c=0')

a=input('podaj wartość a:');

b=input('podaj wartość b:');

c=input('podaj wartość c:');

if a==0&&b==0&&c==0

disp('równanie tożsamościowe')

disp('równanie ma nieskończenie wiele rozwiązań')

elseif a==0&&b==0&&c~=0

disp('równanie sprzeczne')

disp('równanie nie ma rozwiązania')

elseif a==0&&b~=0&&c~=0

disp('równanie liniowe')

disp('równanie ma 1 rozwiązanie')

disp([c])

else a~=0&&b~=0&&c~=0

disp('równanie kwadratowe')

end

if a~=0&&b~=0&&c~=0

delta=b^2-4*a*c

if delta<0

disp('równanie nie ma rozwiązania')

elseif delta==0

disp ('równanie ma 1 rozwiązanie')

x0=-b/(2*a)

else delta>0

disp('równanie ma 2 rozwiązania')

x1 = (-b-sqrt(delta))/(2*a);

x2 = (-b+sqrt(delta))/(2*a);

disp([x1,x2])

end

end

and the result is

[Jan]

Do you see that your code is not readable and that code is nicely formatted in other questions? Please use the "{} Code" button for a proper code formatting.

Answer 1

[Jan]

The ans appears, when a line of code is not terminated by a semicolon.

The number of shown decimals is controlled either generally by the format command. See:

doc format
format short g

You can control the output with more options if you use fprintf:

fprintf('%14.4f', pi)

As usual I suggest to read the Getting Started chapters in the documentation, which explain the basics very efficiently.

[Daniel Siwiec]

So I manage the ans problem but i don't get how to use doc format format short g where shuld i put this in the code?

[Jan]

Type in "doc format" in the command line to find out, how to use the format command.

But I suggest to replace

disp([x1,x2])

by

fprintf('%.5f %.5f\n', x1, x2);