Imagine you want to write a function to calculate the area of a rectangle. However, if you pass a negative number into the function, you don't want it to calculate a negative area. Create a function called calculateArea that takes two Double parameters, x and y, and returns an optional Double. Write a guard statement at the beginning of the function that verifies each of the parameters is greater than zero and returns nil if not. When the guard has succeeded, calculate the area by multiplying x and y together, then return the area. Call the function once with positive numbers and once with at least one negative number. Create a function called add that takes two optional integers as parameters and returns an optional integer. You should use one guard statement to unwrap both optional parameters, returning nil in the guard body if one or both of the parameters doesn't have a value. If both parameters can successfully be unwrapped, return their sum. Call the function once with non-nil numbers and once with at least one parameter being nil.

Imagine you want to write a function to calculate the area of a rectangle. However, if you pass a negative number into the function, you don't want it to calculate a negative area. Create a function called calculateArea that takes two Double parameters, x and y, and returns an optional Double. Write a guard statement at the beginning of the function that verifies each of the parameters is greater than zero and returns nil if not. When the guard has succeeded, calculate the area by multiplying x and y together, then return the area. Call the function once with positive numbers and once with at least one negative number. Create a function called add that takes two optional integers as parameters and returns an optional integer. You should use one guard statement to unwrap both optional parameters, returning nil in the guard body if one or both of the parameters doesn't have a value. If both parameters can successfully be unwrapped, return their sum. Call the function once with non-nil numbers and once with at least one parameter being nil.

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

How do you do this exercise on Guard statements using Swift code?

Imagine you want to write a function to calculate the area of a rectangle. However, if you pass a negative number into the function, you don't want it to calculate a negative area. Create a function
called calculateArea that takes two Double parameters, x and y, and returns an optional Double. Write a guard statement at the beginning of the function that verifies each of the parameters
is greater than zero and returns nil if not. When the guard has succeeded, calculate the area by multiplying x and y together, then return the area. Call the function once with positive numbers
and once with at least one negative number.
Create a function called add that takes two optional integers as parameters and returns an optional integer. You should use one guard statement to unwrap both optional parameters, returning
nil in the guard body if one or both of the parameters doesn't have a value. If both parameters can successfully be unwrapped, return their sum. Call the function once with non-nil numbers
and once with at least one parameter being nil.

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