Add C++ concepts enum, enum class

Author: rp-code9

C++-Concepts/Chapter8-enums/82-enums.cpp

@@ -0,0 +1,29 @@
+// enums https://www.learncpp.com/cpp-tutorial/enumerated-types/
+
+#include <iostream>
+
+int main()
+{
+    enum Color
+    {
+        color_red,
+        color_blue
+    };
+
+    enum Fruit
+    {
+        fruit_apple,
+        fruit_banana
+    };
+
+    Color color { color_blue };
+    Fruit fruit { fruit_banana };
+
+    if (color == fruit) {
+        std::cout << "color and fruit are equal\n";
+    } else {
+        std::cout << "color and fruit are not equal\n";
+    }
+
+    return 0;
+}

C++-Concepts/Chapter8-enums/83-enum-class.cpp

@@ -0,0 +1,32 @@
+// enum classes https://www.learncpp.com/cpp-tutorial/enum-classes/
+
+#include <iostream>
+
+#include <iostream>
+
+int main()
+{
+    enum class Color
+    {
+        color_red,
+        color_blue
+    };
+
+    enum class Fruit
+    {
+        fruit_apple,
+        fruit_banana
+    };
+
+    Color color { Color::color_blue };
+    Fruit fruit { Fruit::fruit_banana };
+
+    if (color == fruit) {
+        std::cout << "color and fruit are equal\n";
+    } else {
+        std::cout << "color and fruit are not equal\n";
+    }
+
+    return 0;
+}
+

C++-Concepts/Chapter8-enums/832-enum-class.cpp

@@ -0,0 +1,20 @@
+// enum classes https://www.learncpp.com/cpp-tutorial/enum-classes/
+
+#include <iostream>
+
+#include <iostream>
+
+int main()
+{
+    enum class Color
+    {
+        color_red,
+        color_blue
+    };
+
+    Color color { Color::color_blue };
+
+    std::cout << static_cast<int>(color) << "\n";
+
+    return 0;
+}

C++-Concepts/RandomNumbers/PRNG-Bad.cpp

@@ -0,0 +1,23 @@
+// https://www.learncpp.com/cpp-tutorial/random-number-generation/
+
+#include <iostream>
+
+unsigned int PRNG()
+{
+    static unsigned int seed { 5323 };
+    seed = 8253729 * seed + 2396403;
+    return seed % 32768;
+}
+
+int main()
+{
+    for (int i {1}; i <= 100; ++i) {
+        std::cout << PRNG() << "\t";
+
+        if (i % 5 == 0) {
+            std::cout << "\n";
+        }
+    }
+
+    return 0;
+}

C++-Concepts/RandomNumbers/Srand.cpp

@@ -0,0 +1,20 @@
+// https://www.learncpp.com/cpp-tutorial/random-number-generation/
+
+#include <iostream>
+#include <cstdlib>
+
+int main()
+{
+    std::srand(5232);
+    std::rand();
+
+    for (int i {1}; i <= 100; ++i) {
+        std::cout << std::rand() << "\t";
+
+        if (i % 5 == 0) {
+            std::cout << "\n";
+        }
+    }
+
+    return 0;
+}

C++-Concepts/RandomNumbers/Srand2.cpp

@@ -0,0 +1,38 @@
+// https://www.learncpp.com/cpp-tutorial/random-number-generation/
+
+#include <iostream>
+#include <cstdlib>
+#include <ctime>
+
+
+int getRandomNumber(int min, int max)
+{
+    static constexpr double fraction {1.0 / (RAND_MAX + 1.0)};
+    return min + static_cast<int>((max - min + 1) * (std::rand() * fraction));
+}
+
+int main()
+{
+    std::srand(static_cast<unsigned int>(std::time(nullptr)));
+    std::rand();
+
+    for (int i {1}; i <= 100; ++i) {
+        std::cout << std::rand() << "\t";
+
+        if (i % 5 == 0) {
+            std::cout << "\n";
+        }
+    }
+
+    std::cout << "====================================\n";
+
+    for (int i {1}; i <= 100; ++i) {
+        std::cout << getRandomNumber(0, 100) << "\t";
+
+        if (i % 5 == 0) {
+            std::cout << "\n";
+        }
+    }
+
+    return 0;
+}

README.md

@@ -36,6 +36,8 @@ Short sample program to demonstrate C++ language basics
 * move semantics
 * move constructor
 * move assignment
+* enums & enum class
+* Random numbers
 
 
 # [Operating System Concepts](Operating-System-Concepts/)