How to change my unit to SI?

Hi I am writing a program that calculates the area of a given shape, here is an example for a square. The problem is that when I enter s=5, the end result of A is 2809 when it should be 25.

Here is the program

h=input('What shape do you want?:','s'); if strcmp(h, 'square') s=input('The length of a side is (m):','s'); A=s*s disp(A) end

Answer 1

[Star Strider]

The problem is that you do not want to use the 's' option if you want a numeric input. (The 's' specifies a char input.)

Do this instead:

s=input('The length of a side is (m): ');

That will give you a numeric result for ‘s’ here.

Answer 2

[Image Analyst]

For what it's worth, see my attached spatial calibration demo.