first lesson is done

1l_ChukarkovKonstantin.playground/Contents.swift

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+import UIKit
+
+// 1) квадратное уравнение вида: ax^2+bx+c=0.
+
+func radicalEquation(a: Double, b: Double, c: Double){
+    let a: Double = a
+    let b: Double = b
+    let c: Double = c
+    let discriminant = (b*b)-(4*a*c)
+
+    if a == 0 {
+        let radical: Double = (-1*c)/b
+        print("У уравнения один корень и он равен \(radical)")
+    }else if discriminant < 0 {
+        print("У уравнения корней нет")
+    }else if discriminant == 0 {
+        let radical = (-1*b)/(2*a)
+        print("У вашего уравнения один корень и он равен \(radical)")
+    }else if discriminant > 0 {
+        let radicalOne: Double = ((-1*b)+sqrt(discriminant)/(2*a))
+        let radicalTwo: Double = ((-1*b)-sqrt(discriminant)/(2*a))
+        print("У вашего уравнения 2 корня \(radicalOne) и \(radicalTwo)")
+    }
+}
+radicalEquation(a: 1, b: -8, c: 15)
+
+// 2) Прямоугольный треугольник, где а и b его катеты.
+
+func rightTriangle(a: Double, b: Double){
+    let a: Double = a
+    let b: Double = b
+    let square: Double = a*b/2
+    let c: Double = sqrt((a*a)+(b*b))
+    let p: Double = a+b+c
+    print("Плошадь треугольника равна \(square), длина гипотенузы равна \(c), периметр треуголька равен \(p)")
+}
+rightTriangle(a: 3, b: 4)
+
+// 3) Вклад на n лет, под percent процентов годовых от sum суммы.
+
+func vklad(sum: Double, percent: Double, n: Int){
+    var sum: Double = sum
+    let percent = percent
+    let n: Int = n
+    var i: Int = 1
+    while i <= n {
+        let totalPercent: Double = 1+(percent/100)
+        sum = sum*totalPercent
+        i += 1
+    }
+    sum = (sum*100).rounded(.toNearestOrAwayFromZero)/100
+    print("Сумма вклада через \(n) лет равна \(sum)")
+}
+vklad(sum: 10000, percent: 13, n: 5)

1l_ChukarkovKonstantin.playground/contents.xcplayground

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>

1l_ChukarkovKonstantin.playground/playground.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

1l_ChukarkovKonstantin.playground/timeline.xctimeline

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+<?xml version="1.0" encoding="UTF-8"?>
+<Timeline
+   version = "3.0">
+   <TimelineItems>
+      <LoggerValueHistoryTimelineItem
+         documentLocation = "file:///Users/konstantin/Desktop/SwiftFirst/1l_ChukarkovKonstantin.playground#CharacterRangeLen=18&amp;CharacterRangeLoc=1500&amp;EndingColumnNumber=0&amp;EndingLineNumber=48&amp;StartingColumnNumber=13&amp;StartingLineNumber=47&amp;Timestamp=610978049.8329"
+         selectedRepresentationIndex = "0"
+         shouldTrackSuperviewWidth = "NO">
+      </LoggerValueHistoryTimelineItem>
+   </TimelineItems>
+</Timeline>