How do you create a a display function that includes changing variables?

Is it correct to use the disp and the num2str function together and what additional formatting is needed to combine them?

For example: I want to add a changing variable into the text "An area of a circle with radius r cm equals an area of A cm^2." Where r and A are changing variables.

[Stephen23]

Actually disp displays numeric values too, so it is not required to use num2str before disp. Try it!

Answer 1

[Andrew Phung]

If you want r and A to be able to change in the display when the values are changed in the script, use brackets after the open parenthesis and before the close parenthesis. This indicates to MATLAB that there are strings and variables in your disp command.

For example:

 r = 7;
 A = pi*r^2;

 disp(['An area of a circle with radius ', num2str(r),' cm equals an' ... 
    ' area of ', num2str(A),' cm^2.'])

The output would be

 An area of a circle with radius 7 cm equals an area of 153.938 cm^2.