String Reversal Tool (Assignment) in Swift by Jonathan S

string_reversal.swift

/*

REFERENCE: Text Based Interface in Swift

print("Enter text here> ")
var userInput = readLine()!
print("User entered: \(userInput)")

*/

// Jonathan, make me a string reversal script in Swift (please)

// Step 1: Greet the user (Jonathan's String Reversal Tool)

// Step 2: Prompt the user to enter a string to be reversed 

// Step 3: Create a new empty string

// Step 4: 

print("Welcome to Jonathan's String Reversal Tool!")
print("Enter a phrase and have it reversed> ")
var userInput = readLine()!

// Jonathan, we need to make a second (empty) string
// We will put the characters from the old string
// into the new string, to build the 'reversed string'
// We will accomplish this using the loop we created
// below, that happens to count backwards.
// The first time the loop runs, the last letter
// of the userInput string will be represented as
// userInput[i], therefore we can add this last
// letter to our new string. We will continue 
// doing this, as we loop backwards through the
// userInput string.

// userInput[i]

// REFERENCE (get char in swift): https://stackoverflow.com/questions/24092884/get-nth-character-of-a-string-in-swift-programming-language
// var firstChar = Array(string)[0]

var myNewString: String = ""

var i = userInput.count
while i <= userInput.count && i > 0 {
    i = i - 1
    let myChar = Array(userInput)[i]

    /*
    print(myChar)
    */
    // Jonathan, You need to create a new (empty) string OUTSIDE
    // of this loop. THEN, inside this loop, add the new character (myChar)
    // to your new string. Go!

    // Hint, write your code here Jonathan...
    myNewString = myNewString + String(myChar)
}

print(myNewString)