Add new cpp/algorithms directory, include basic selection sort example

cpp/algorithms/sorting/selection/CMakeLists.txt

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+###############################################################################
+## Author: Shaun Reed                                                        ##
+## Legal: All Content (c) 2020 Shaun Reed, all rights reserved               ##
+## About: A basic CMakeLists configuration to practice selection sort        ##
+##                                                                           ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0  ##
+###############################################################################
+
+cmake_minimum_required(VERSION 3.17)
+project(SelectionSort LANGUAGES CXX)
+
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
+
+add_executable(select-sort "select-sort.cpp")
+
+add_library(lib-select "lib-select.cpp")
+target_link_libraries(select-sort lib-select)

cpp/algorithms/sorting/selection/lib-select.cpp

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+/*#############################################################################
+## Author: Shaun Reed                                                        ##
+## Legal: All Content (c) 2020 Shaun Reed, all rights reserved               ##
+## About: An example implementation of selection sort using a custom library ##
+##                                                                           ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0  ##
+###############################################################################
+*/
+
+#include "lib-select.h"
+
+#include <iostream>
+
+static int FindMinIndex(int const arr[], int start) {
+  // Assume we are at the minimum index until another is found
+  int min = start;
+  for (int i = start; i < 10; i++) {
+    if (arr[min] > arr[i]) min = i;
+  }
+  return min;
+}
+
+int * RandomArray() {
+  static int newArray[ARRAY_LENGTH];
+  srand(time(NULL));
+
+  int randMax = 1000;
+  for (int i = 0; i < ARRAY_LENGTH; i++) {
+    newArray[i] = random() % randMax;
+  }
+  return newArray;
+}
+
+void SelectionSort(int arr[]) {
+  for (int leftIndex = 0; leftIndex < ARRAY_LENGTH; leftIndex++) {
+    // Check for a different minimum in the unsorted portion of the array
+    int min = FindMinIndex(arr, leftIndex);
+
+    // If the minimum index has changed from it's origin, swap the elements
+    if (min != leftIndex) std::swap(arr[leftIndex], arr[min]);
+  }
+}
+
+void PrintArray(int arr[]) {
+  for (int i = 0; i < ARRAY_LENGTH; i++) {
+    std::cout << arr[i] << std::endl;
+  }
+  std::cout << std::endl;
+}

cpp/algorithms/sorting/selection/lib-select.h

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+/*#############################################################################
+## Author: Shaun Reed                                                        ##
+## Legal: All Content (c) 2020 Shaun Reed, all rights reserved               ##
+## About: An example implementation of selection sort using a custom library ##
+##                                                                           ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0  ##
+###############################################################################
+*/
+
+#ifndef LIB_SELECT_H
+#define LIB_SELECT_H
+
+#define ARRAY_LENGTH 10
+
+/** RandomArray
+ * Returns an array automatically filled with random values
+ *  Sizes array to match length setting ARRAY_LENGTH
+ * @return A pointer to a static array
+ */
+int * RandomArray();
+
+/** SelectionSort
+ * Sorts an array of integers in ascending order
+ * @param arr The array to sort
+ */
+void SelectionSort(int arr[]);
+
+/** PrintArray
+ * Prints an array based on the define ARRAY_LENGTH
+ * @param arr The array to print
+ */
+void PrintArray(int arr[]);
+
+#endif // LIB_SELECT_H

cpp/algorithms/sorting/selection/select-sort.cpp

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+/*#############################################################################
+## Author: Shaun Reed                                                        ##
+## Legal: All Content (c) 2020 Shaun Reed, all rights reserved               ##
+## About: An example implementation of selection sort using a custom library ##
+##                                                                           ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0  ##
+###############################################################################
+*/
+
+#include "lib-select.h"
+
+#include <iostream>
+
+int main(const int argc, char const * argv[]) {
+  // Create a random array based on ARRAY_LENGTH setting in lib-select.cpp
+  int * numArray = RandomArray();
+
+  std::cout << "Unsorted array: \n";
+  PrintArray(numArray);
+
+  // Sort the array and print the new contents
+  SelectionSort(numArray);
+  std::cout << "\nSorted array: \n";
+  PrintArray(numArray);
+
+  return 0;
+}