colinfwalsh / swift-mathBoolOpConSwitch-lab-ios-0616

Fun with Basics!

If you don't know, the thing to do is not to get scared, but to learn. -Ayn Rand

##Instructions In this final lab you'll be writing three functions. All of your functions should be written in the ViewController.swift file located in the .xcworkspace file (included with this repo.).

1 - Create a function named averageIsAbove75 that takes in three arguments all of type Double with a return type of type Bool. It should take these three values and find their average. If the average is greater than 75, then return true, else return false.

If you were to call on this function, it would yield the following results. Notice how there are no external names to the parameters when this function is called.

averageIsAbove75(55, 25, 24)
// false

averageIsAbove75(100, 85, 90)
// true

2 - Create a function named passwordCombo that takes in two arguments, one of type String which represents the username and the other of type Int which represents the password. This function will return a String letting the caller of this function know if the username/password combo passed into the function is correct!

What makes it correct? The conditions are.. the username String must be either 'Jerry', 'Elane', or 'Michael'. The password must be divisible by 3. If the username + password conditions pass, then return back the String "Welcome!". If either fail, then the String to be returned should be "Access Denied"

Calling this function should yield the following results. Notice the external names of these arguments when calling on this function.

passwordCombo(username: "Bran", password: 22)
// "Access Denied

passwordCombo(username: "Elane", password: 20)
// "Access Denied"

passwordCombo(username: "Elane", password: 33)
// "Welcome!"

3 - Write a function named doIt which takes in two arguments: "a" (which is of type String) and "b" (which is of type Float) and returns a Float.

Here is how doIt should work:

• if a is between 1 and 5 (inclusive) and b is between 10.5 and 15.0 (inclusive) or between 20.0 and 30.5 (inclusive) then return the product of a and b, otherwise.. return 0.0
• You don't yet know how to turn a Float into a String - so instead you can apply a technique like this to solve this problem using an if-else statement, or you can use a switch statement applying a similar technique.

if a == "1" { 
	// use 1 to do math stuff, not "1" because we know that a is "1"!
} else if a == "2" {
	// do something with 2
}

Here are some examples (notice how both parameters have no external names).

let a = doIt("2", 10.5)
// a = 21.0

let b = doIt("9", 10.5)
// b = 0.0  because the first paramter is out of range

let c = doIt("2", 7)
// c = 0.0  because the second parameter is out of range

Your code might be more clear and debuggable if you break it up into multiple functions instead of having one "big" function.

View this lesson on Learn.co