iOS repl.it - Optionals Challenge Solution

optionals.swift

//Don't change this
var studentsAndScores = ["Amy": Int(readLine()!)!, "James": Int(readLine()!)!, "Helen": Int(readLine()!)!]

func highestScore(scores: [String: Int]) {
  
  //Write your code here.
  let a = studentsAndScores["Amy"]!
  let b = studentsAndScores["James"]!
  let c = studentsAndScores["Helen"]!
  
  var temp = 0
  //If a is greater than b
  if a > temp {
    //And a is also greater than c
    temp = a
  }
    
  if b > temp {
    temp = b
  }
  
  if c > temp {
    temp = c
  }
  
  print(temp)
  
  
}

//Don't change this
highestScore(scores: studentsAndScores)

Tried this and it works -

var studentsAndScores = ["Amy": Int(readLine()!)!, "James": Int(readLine()!)!, "Helen": Int(readLine()!)!]

func highestScore(scores: [String: Int]) {

//Write your code here.

let maxScore = (scores.values.max())!
if maxScore > 0 {
print(maxScore)
}

}

Like the solution but tried avoiding forced unwrapping and it worked:

var studentsAndScores = ["Amy": Int(readLine()!)!, "James": Int(readLine()!)!, "Helen": Int(readLine()!)!]

func highestScore(scores: [String: Int]) {

//Write your code here.

let a = studentsAndScores["Amy"]
let b = studentsAndScores["James"]
let c = studentsAndScores["Helen"]

var temp = 0

if let a = a {
if a > temp { temp = a }
}
if let b = b {
if b > temp { temp = b }
}
if let c = c {
if c > temp { temp = c }
}
print(temp)
}

highestScore(scores: studentsAndScores)

//Don't change this
var studentsAndScores = ["Amy": 78, "James": 55, "Helen": 86]

func highestScore(scores: [String: Int]) {

//Write your code here.

let amyScore = scores ["Amy"]!
let jamesScore = scores ["James"]!
let helenScore = scores ["Helen"]!

var Ttemp = 0

if amyScore > Ttemp {
    Ttemp = amyScore
}  
if jamesScore > Ttemp{
    Ttemp = jamesScore
} 
if helenScore > Ttemp{
    Ttemp = helenScore
}
print (Ttemp)

}

//the result is 86 not 99, the hellen score must be changed to 86, in order to solve the challenge

it didn't pass but my answer is the simplest?

var studentsAndScores = ["Amy": 88, "James": 55, "Helen": 99]

func highestScore() {

print("\(studentsAndScores.values.max()!)")
}
highestScore()

There is no need to create a variable called temp

var studentsAndScores = ["Amy": Int(readLine()!)!, "James": Int(readLine()!)!, "Helen": Int(readLine()!)!]

func highestScore(scores: [String: Int]) {

// Store the scores and force unwrap it

 let a = studentsAndScores["Amy"]!
 let b = studentsAndScores["James"]!
 let c = studentsAndScores["Helen"]!
    
// Create a nested if statement

    if a > b{
         if a > c{
             print(a)
         }
     }
     if b > c{
         if b > a{
             print(b)
         }
     }
     if c > a{
         if c > b{
             print(c)
         }
     }
}

Here's how I solved this exercise:

//Don't change this
var studentsAndScores = ["Amy": Int(readLine()!)!, "James": Int(readLine()!)!, "Helen": Int(readLine()!)!]

func highestScore(scores: [String: Int]) {

//Write your code here.
let a = studentsAndScores["Amy"]!
let b = studentsAndScores["James"]!
let c = studentsAndScores["Helen"]!

if a > b && a > c {
print(a)
} else if b > a && b > c {
print(b)
} else {
print(c)
}

}

// List of students with their scores
var studentsAndScores = ["Amy": 10, "James": 5, "Helen": 7]

// Function that takes a dictionary as a parameter to find and print the highest score among students
func highestScore(scores: [String: Int]) {
    print(studentsAndScores.values.max()!)
}

// We call the function and pass studentsAndScores dictionary as an argument
highestScore(scores: studentsAndScores) // Output: 10