Matlab Question

The area A of a rectangle is defined as A=lw, where L and w are the length and width of the rectangle. Write a script called area that first prompts the user for the length and width of the rectangle. If either is a negative number or zero, the script prints an error message. Otherwise, if they are both positive, it calls a function rectanglearea to return the area of the rectangle, and prints the result. Write the function, also! The length and width of the rectangle are passed to the rectanglearea function.