From 89f3e69df5984eb8a12979932261cf121dabd370 Mon Sep 17 00:00:00 2001
From: Inex Code <gitea@inex.rocks>
Date: Sat, 19 Sep 2020 14:26:49 +0000
Subject: [PATCH] hw1 task3 done

---
 Hw1/task3.cpp | 71 +++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 66 insertions(+), 5 deletions(-)

diff --git a/Hw1/task3.cpp b/Hw1/task3.cpp
index 60d2f53..56c651f 100644
--- a/Hw1/task3.cpp
+++ b/Hw1/task3.cpp
@@ -4,20 +4,23 @@
 
 using namespace std;
 
-// TODO: finish implementation
 class Hop {
 private:
-    double maxheight, startVelocity, startTime;
+    double maxheight, startTime;
     bool isHalfed;
     const double loss = 0.7;
-    const double g = 10;
+    const double g = 9.8;
 
 public:
     Hop(double initHeight, bool starter);
     ~Hop();
     double hopTime();
+    double getMaxVelocity();
+    double getMaxHeight();
     double getPosition(double time);
     double getVelocity(double time);
+    double getEndTime();
+    void makeHop();
 };
 
 Hop::Hop(double initHeight, bool starter)
@@ -25,7 +28,6 @@ Hop::Hop(double initHeight, bool starter)
     maxheight = initHeight;
     isHalfed = starter;
     startTime = 0;
-    startVelocity = 0;
 }
 
 double Hop::hopTime()
@@ -37,7 +39,38 @@ double Hop::hopTime()
 
 double Hop::getPosition(double time)
 {
-    return time * startVelocity - g * time * time / 2;
+    if (isHalfed)
+        return maxheight - g * (time - startTime) * (time - startTime) / 2;
+    return (time - startTime) * getMaxVelocity() - g * (time - startTime) * (time - startTime) / 2;
+}
+
+double Hop::getVelocity(double time)
+{
+    if (isHalfed)
+        return 0 - g * (time - startTime);
+    return getMaxVelocity() - g * (time - startTime);
+}
+
+double Hop::getMaxVelocity()
+{
+    return sqrt(2 * g * maxheight);
+}
+
+void Hop::makeHop()
+{
+    startTime += hopTime();
+    maxheight *= 0.7;
+    isHalfed = false;
+}
+
+double Hop::getEndTime()
+{
+    return startTime + hopTime();
+}
+
+double Hop::getMaxHeight()
+{
+    return maxheight;
 }
 
 Hop::~Hop()
@@ -46,5 +79,33 @@ Hop::~Hop()
 
 int main()
 {
+    double init_height, time;
+    int i = 0;
+    cout << "Enter initial height in meters: ";
+    cin >> init_height;
+    cout << "Enter desired time in seconds: ";
+    cin >> time;
+
+    if (init_height > 0.0 && time > 0.0) {
+        cout << "Modelling...\n";
+        Hop a(init_height, true);
+        while (a.getEndTime() < time && i < 100) {
+            a.makeHop();
+            i++;
+        }
+        if (a.getEndTime() < time && i == 100) {
+            cerr << "Too many iterations. Aborting." << endl;
+            return 2;
+        }
+        cout << "Hop №" << i << endl;
+        cout << "Height is " << a.getPosition(time) << " m\n";
+        cout << "Velocity is " << a.getVelocity(time) << " m/s\n";
+
+        return 0;
+    } else {
+        cout << "Illegal height or time.\n";
+        return 1;
+    }
+
     return 0;
 }
\ No newline at end of file