From 26d8361a1878be666ed19599530d7c79d6d14efe Mon Sep 17 00:00:00 2001
From: Alexander Zhirov <alexander@zhirov.website>
Date: Sat, 19 Jun 2021 01:15:56 +0300
Subject: [PATCH] lesson 1

---
 lesson_1/exercise_1.hpp | 21 ++++++++++++++++++++
 lesson_1/exercise_2.hpp | 23 +++++++++++++++++++++
 lesson_1/exercise_3.hpp | 44 +++++++++++++++++++++++++++++++++++++++++
 lesson_1/main.cpp       | 42 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 130 insertions(+)
 create mode 100644 lesson_1/exercise_1.hpp
 create mode 100644 lesson_1/exercise_2.hpp
 create mode 100644 lesson_1/exercise_3.hpp
 create mode 100644 lesson_1/main.cpp

diff --git a/lesson_1/exercise_1.hpp b/lesson_1/exercise_1.hpp
new file mode 100644
index 0000000..9ca419c
--- /dev/null
+++ b/lesson_1/exercise_1.hpp
@@ -0,0 +1,21 @@
+#include <math.h>
+
+class Power
+{
+private:
+    float a = 0;
+    float b = 0;
+public:
+    Power() {}
+
+    void set(float num_a, float num_b)
+    {
+        a = num_a;
+        b = num_b;
+    }
+
+    float calculate()
+    {
+        return pow(a, b);
+    }
+};
diff --git a/lesson_1/exercise_2.hpp b/lesson_1/exercise_2.hpp
new file mode 100644
index 0000000..e912502
--- /dev/null
+++ b/lesson_1/exercise_2.hpp
@@ -0,0 +1,23 @@
+#include <cstdint>
+#include <iostream>
+
+class RGBA
+{
+private:
+    std::uint8_t m_red;
+    std::uint8_t m_green;
+    std::uint8_t m_blue;
+    std::uint8_t m_alpha;
+public:
+    RGBA(std::uint8_t red = 0, std::uint8_t green = 0, std::uint8_t blue = 0, std::uint8_t alpha = 255) :
+        m_red(red), m_green(green), m_blue(blue), m_alpha(alpha) {}
+
+    void print()
+    {
+        std::cout << "r=" << static_cast<int>(m_red) <<
+            " g=" << static_cast<int>(m_green) <<
+            " b=" << static_cast<int>(m_blue) <<
+            " a=" << static_cast<int>(m_alpha) << std::endl;
+    }
+
+};
diff --git a/lesson_1/exercise_3.hpp b/lesson_1/exercise_3.hpp
new file mode 100644
index 0000000..a17ece2
--- /dev/null
+++ b/lesson_1/exercise_3.hpp
@@ -0,0 +1,44 @@
+#include <iostream>
+
+class Stack
+{
+private:
+    int array[10];
+    int length = 0;
+
+public:
+    Stack() {}
+
+    void reset()
+    {
+        while (length)
+            array[length--] = 0;
+    }
+
+    bool push(int num)
+    {
+        if (length > 9)
+            return false;
+        else
+            array[length++] = num;
+
+        return true;
+    }
+
+    int pop()
+    {
+        if (length)
+            return array[length--];
+        else
+            std::cout << "Stack is empty!" << std::endl;
+
+        return -1;
+    }
+
+    void print()
+    {
+        for (int i = 0; i < length; i++)
+            std::cout << array[i] << ' ';
+        std::cout << std::endl;
+    }
+};
diff --git a/lesson_1/main.cpp b/lesson_1/main.cpp
new file mode 100644
index 0000000..9e2ec9e
--- /dev/null
+++ b/lesson_1/main.cpp
@@ -0,0 +1,42 @@
+#include <iostream>
+#include "exercise_1.hpp"
+#include "exercise_2.hpp"
+#include "exercise_3.hpp"
+
+using namespace std;
+
+int main()
+{
+    // Exercise 1
+    Power Num;
+
+    Num.set(2.0, 3.0);
+    cout << Num.calculate() << endl;
+
+    // Exercise 2
+
+    RGBA Color1;
+    Color1.print();
+    RGBA Color2(100, 123, 210, 13);
+    Color2.print();
+
+    // Exercise 3
+
+    Stack stack;
+    stack.reset();
+    stack.print();
+
+    stack.push(3);
+    stack.push(7);
+    stack.push(5);
+    stack.print();
+
+    stack.pop();
+    stack.print();
+
+    stack.pop();
+    stack.pop();
+    stack.print();
+
+    return 0;
+}
-- 
2.40.1