new file: Calculator.cpp

new file:   CalculatorFunctions.cpp
	new file:   CalculatorFunctions.h
	new file:   Installer.sh

Calculator.cpp

@@ -0,0 +1,82 @@
+#include <iostream>
+#include <functional>
+#include <cmath>
+#include <fstream>
+#include "NewCalcFunctions.h"
+double total_num;
+int end_option;
+int option;
+bool loop = true;
+int main()
+{
+    while (loop)
+    {
+        std::cout << "Please select an option from the list:\n";
+        std::cout << "1: Add | 2: Subtract | 3: Divide | 4: Multiply | 5: Square root \n";
+        std::cin >> option;
+        switch (option)
+        {
+        case 1:
+            total_num = math("Addition", std::plus<>(), false);
+            std::cout << total_num << '\n';
+            break;
+        case 2:
+            total_num = math("Subtraction", std::minus<>(), false);
+            std::cout << total_num << "\n";
+            break;
+        case 3:
+            total_num = math("Division", std::divides<>(), false);
+            std::cout << total_num << "\n";
+            break;
+        case 4:
+            total_num = math("Multiplication", std::multiplies<>(), false);
+            std::cout << total_num << "\n";
+            break;
+        case 5:
+            total_num = square_root("Square root", false);
+            std::cout << total_num << "\n";
+            break;
+        }
+        std::cout << "Please choose an option from the list:" << '\n';
+        std::cout << "1: Continue | 2: Conitnue with number from last problem | 3: Exit the program" << '\n';
+        std::cin >> end_option;
+        if (end_option == 1)
+        {
+            loop = true;
+        }
+        else if (end_option == 2)
+        {
+            std::cout << "Please select an option from the list:\n";
+            std::cout << "1: Add | 2: Subtract | 3: Divide | 4: Multiply | 5: Square root \n";
+            int option2;
+            std::cin >> option2;
+            switch (option2)
+            {
+            case 1:
+                total_num = math("Add", std::plus<>(), true);
+                std::cout << total_num << '\n';
+                break;
+            case 2:
+                total_num = math("Subtract", std::minus<>(), true);
+                std::cout << total_num << "\n";
+                break;
+            case 3:
+                total_num = math("Divide", std::divides<>(), true);
+                std::cout << total_num << "\n";
+                break;
+            case 4:
+                total_num = math("Multiply", std::multiplies<>(), true);
+                std::cout << total_num << "\n";
+                break;
+            case 5:
+                total_num = square_root("Square root", true);
+                std::cout << total_num << "\n";
+                break;
+            }
+        }
+        else if (end_option == 3)
+        {
+            loop = false;
+        }
+    }
+}

CalculatorFunctions.cpp

@@ -0,0 +1,62 @@
+#include "NewCalcFunctions.h"
+#include <iostream>
+#include <functional>
+#include <cmath>
+#include <fstream>
+using namespace std;
+double math(std::string text, std::function<double(double, double)> code, bool use_last_num)
+{
+    double total_num;
+    double num1;
+    double num2;
+    std::ofstream num_write;
+    num_write.open("last-total-num.txt", ios::out);
+    if (!use_last_num)
+    {
+        std::cout << text << "\n";
+        std::cout << "Please enter in the first number here: \n";
+        std::cin >> num1;
+        std::cout << "Please enter in the last number here: \n";
+        std::cin >> num2;
+        total_num = code(num1, num2);
+        num_write << total_num;
+        num_write.close();
+    }
+    else
+    {
+        num_write << total_num;
+        num_write.close();
+        std::ifstream num_read;
+        num_read.open("last-total-num.txt", ios::in);
+        double last_num;
+        num_read >> last_num;
+        total_num = 0;
+        std::cout << text << "\n";
+        std::cout << "Fetching last number...\n";
+        std::cout << "Please enter the number here: \n";
+        std::cin >> num2;
+        total_num = code(num2, last_num);
+    }
+    return total_num;
+}
+double square_root(std::string text, bool use_last_num)
+{
+    double total_num;
+    if (!use_last_num)
+    {
+        std::cout << text << '\n';
+        std::cout << "Please enter the number you would like to find the square root of here: \n";
+        double sqrt_num;
+        std::cin >> sqrt_num;
+        total_num = sqrt(sqrt_num);
+    }
+    else
+    {
+        std::ifstream num_read;
+        num_read.open("last-total-num.txt", ios::in);
+        double last_num;
+        num_read >> last_num;
+        total_num = sqrt(last_num);
+    }
+    return total_num;
+}

CalculatorFunctions.h

@@ -0,0 +1,5 @@
+#include <iostream>
+#include <cmath>
+#include <functional>
+double math(std::string text, std::function<double(double, double)> code, bool use_last_num);
+double square_root(std::string, bool use_last_num);

Installer.sh

@@ -0,0 +1,9 @@
+ #!/bin/bash
+ echo "Compiling..."
+clang++ NewCalc.cpp NewCalcFunctions.cpp -std=c++17 -o Calculator
+echo "Done!"
+echo "Cleaning up..."
+sleep 1
+mv Calculator ${HOME}/Desktop
+rmdir --ignore-fail-on-non-empty ${HOME}/Terminal-Based-Calculator
+echo "Done! Now enjoy your calculator :)!"