Week 8: Assignment - Recursion

week-08/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+project(week-08)
+
+set(CMAKE_CXX_STANDARD 14)
+
+add_executable(week-08 main.cpp)

week-08/main.cpp

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+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Champlain College SDEV-345-81
+ *
+ * C++ Week 8: Recursion (first semester) - (2020/10/24)
+ *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ *
+ * Write a recursive algorithm to output the hexadecimal representation of an integer.
+ *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ *
+ * Written by Llewellyn van der Merwe <llewellyn.vandermerw@mymail.champlain.edu>, October 2020
+ * Copyright (C) 2020. All Rights Reserved
+ * License GNU/GPL Version 2 or later - http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#include<iostream>
+
+using namespace std;
+
+// function declaration
+void getHexadecimal();
+string getHexadecimal(long value);
+void getHexadecimal(long value, string& answer);
+
+int main() {
+    // lets start our program to get hexadecimal
+    getHexadecimal();
+    return 0;
+}
+
+// function to get the hexadecimal value
+void getHexadecimal() {
+    // long value to hold 64 bit integers
+    long number;
+    bool show = true;
+    // ask the question
+    while (true) {
+        if (show) {
+            cout << "Enter [n] at any time to stop." << endl;
+            cout << endl;
+            // show this notice only once
+            show = false;
+        }
+        cout << "████████████████████████████████████" << endl;
+        cout << " Convert a integer to hexadecimal" << endl;
+        cout << " Enter an integer: ";
+        cin >> number;
+        // if no integer is added stop
+        if (cin.fail()) {
+            break;
+        }
+        // printout the answer in bold yellow
+        cout << " Hexadecimal: \e[1m\e[33m" << getHexadecimal(number) << "\e[0m" << endl;
+    }
+}
+
+// starter function to get the hexadecimal value
+string getHexadecimal(long value) {
+    // we use a string to hold the answer
+    string answer;
+    // we start the recursion quest
+    getHexadecimal(value, answer);
+    // we return the answer
+    return answer;
+}
+
+// recursive function to get the hexadecimal value
+void getHexadecimal(long value, string& answer) {
+    // we have a sum value for calculation
+    long sum;
+    // we are at the end point and should start
+    // working up the stack
+    if (value == 0)
+        return;
+    // keep going
+    getHexadecimal(value / 16, answer);
+    // now work out each
+    sum = (sum = value % 16) >= 10 ? sum + 55 : sum + 48;
+    // add to our answer
+    answer += (char) sum;
+}