Create main.cpp

Author: Quincy

4.0/main.cpp

@@ -0,0 +1,255 @@
+#include <iostream>
+#include <cmath>
+#include <string>
+#include <vector>
+#include <fstream>
+#include "calculate.h"
+
+double calculation(double numA, double numB, char oper);
+static double question();
+calculate cal;
+std::string fileName = "history.txt";
+extern std::ofstream writeHistory;
+std::ifstream readHistory;
+int HistoryShow();
+double IntroductionInput();
+
+int mainMenu()
+{
+    int choice;
+    std::cout <<"\tMAIN MENU\n\n"<< "1. Use Calculator.\n" << "2. Show History.\n" << "3. Exit\n";
+    while (true)
+    {
+        std::cout << "What is your choice? (0 - 2) ";
+        std::cin >> choice;
+        switch (choice)
+        {
+        case 1:
+            system("cls");
+            IntroductionInput();
+            break;
+        case 2:
+            system("cls");
+            HistoryShow();
+        case 3:
+            writeHistory.close();
+            readHistory.close();
+            exit(0);
+        default:
+            break;
+        }
+    }
+}
+
+void Introduction()
+{
+    std::cout << "\n\tHow to use the calculator: \n\n"<<"Just simply enter the first number of your problem then the operator and then the second number of your problem." << std::endl;
+    std::cout << "Operators are: \"+ for adding, - for subtracting, * for multiplying, / for dividing, ^ for power, s for square root.\"" << std::endl << "\n";
+}
+
+int HistoryShow()
+{
+    int choiceHistory;
+    std::string readHistoryTo;
+    if (!readHistory.is_open())
+    {
+        readHistory.open(fileName);
+    }
+    else if(readHistory.is_open())
+    {
+        readHistory.close();
+        readHistory.open(fileName);
+    }
+    while (!readHistory.eof())
+    {
+        std::getline(readHistory, readHistoryTo);
+        std::cout << readHistoryTo<<std::endl;
+    }
+    while (true)
+    {
+        std::cout << "\n1. Clear History\n" << "2. Return to main menu\n\n";
+        std::cout << "Your Choice? (1 - 2) ";
+        std::cin >> choiceHistory;
+        switch (choiceHistory)
+        {
+        case 1:
+            if (writeHistory.is_open())
+            {
+                writeHistory.close();
+                writeHistory.open(fileName, std::ios::out | std::ios::trunc);
+            }
+            else
+            {
+                writeHistory.open(fileName, std::ios::out | std::ios::trunc);
+            }
+            std::cout << "\nHistory Deleted!!\n";
+            system("pause");
+            system("cls");
+            return mainMenu();
+        case 2:
+            system("cls");
+            return mainMenu();
+            break;
+        default:
+            if (!isdigit(choiceHistory))
+            {
+                std::cout << "\nINVALID INPUT\n";
+                std::cout << "\nYou entered a letter. Only NUMBERS are allowed. To prevent computer damage, we will return you to main menu\n";
+                system("pause");
+                system("cls");
+                return mainMenu();
+            }
+            else if (isdigit(choiceHistory))
+            {
+                std::cout << "\nINVALID INPUT\n";
+            }
+
+            break;
+        }
+    }
+}
+
+double IntroductionInput()
+{
+    double numA;
+    double numB;
+    char oper;
+    bool CINFail = std::cin.fail();
+    Introduction();
+    std::cout << "Enter the first number: ";
+    std::cin >> numA;
+    try
+    {
+        if (std::cin.fail())
+        {
+            throw 1;
+        }
+    }
+    catch (int error)
+    {
+        system("cls");
+        std::cout << "ERROR NUMBER: " << error << std::endl;
+        system("pause");
+        return error;
+    }
+    std::cout << std::endl;
+    std::cout << "Enter the operator: ";
+    std::cin >> oper;
+    std::cout << std::endl;
+    if (oper == 's')
+    {
+        std::cin.ignore();
+        return calculation(numA, 0, oper);
+    }
+    else
+    {
+        std::cout << "Enter the second number: ";
+        std::cin >> numB;
+        try
+        {
+            if (std::cin.fail())
+            {
+                throw 1;
+            }
+        }
+        catch (int error)
+        {
+            system("cls");
+            std::cout << "ERROR NUMBER: " << error << std::endl;
+            system("pause");
+            exit(error);
+        }
+        std::cout << std::endl;
+        return calculation(numA, numB, oper);
+    }
+}
+
+int main()
+{
+    writeHistory.open(fileName, std::ios::app);
+    mainMenu();
+}
+
+double calculation(double numA, double numB, char oper)
+{
+    if (writeHistory.is_open())
+    {
+        if (oper == '+' || oper == '-' || oper == '*' || oper == '/' || oper == '^' || oper == 's')
+        {
+            if (oper == '+')
+            {
+                std::cout << cal.add(numA, numB);
+            }
+            else if (oper == '-')
+            {
+                std::cout << cal.subtract(numA, numB);
+            }
+            else if (oper == '*')
+            {
+                std::cout << cal.multiply(numA, numB);
+            }
+            else if (oper == '/')
+            {
+                std::cout << cal.divide(numA, numB);
+
+            }
+            else if (oper == '^')
+            {
+                std::cout << cal.power(numA, numB);
+            }
+            else if (oper == 's')
+            {
+                std::cout << cal.square(numA, numB);
+            }
+            return question();
+        }
+        else
+        {
+            std::cout << "\nYou have put in an invalid operator/number!\n\a";
+            return question();
+        }
+    }
+    else
+    {
+        try
+        {
+            throw "ERROR WRITING HISTORY TO FILE";
+        }
+        catch (const char* e)
+        {
+            system("cls");
+            std::cout << e << std::endl;
+        }
+    }
+}
+
+double question()
+{
+    while (true)
+    {
+        std::string yn;
+        std::cout << "\nDo you want to use the calculator again? ";
+        std::cin >> yn;
+        std::cout << std::endl;
+        if (yn == "Yes" || yn == "No" || yn == "YES" || yn == "NO" || yn == "YEs" || yn == "nO" || yn == "yes" || yn == "no")
+        {
+            if (yn == "Yes" || yn == "YES" || yn == "YEs" || yn == "yes")
+            {
+                return IntroductionInput();
+            }
+            else if (yn == "No" || yn == "NO" || yn == "nO" || yn == "no")
+            {
+                writeHistory.close();
+                writeHistory.open(fileName, std::ios::app);
+                system("cls");
+                mainMenu();
+            }
+        }
+        else
+        {
+            std::cout << "Invalid answer, try again.\a\n";
+        }
+    }
+
+
+}