simple-calculator.cpp

#include <cmath>
#include <filesystem>
#include <fstream>
#include <iostream>
#include <limits>
#include "variables.hpp"
#include "math-functions.hpp"

std::string name;
double double1;
double double2;
char asmd;

int main() {
    std::cout << "Simple Calculator [v0.3]\n";
    std::cout << " \n";

    std::cout << "What is your name?\n";
    std::cin >> name;

    std::cout << "Welcome to my simple calculator, " << name << ".\n";
    std::cout << " \n";

    while (true) {
        if (std::filesystem::exists("history.mdta") && std::filesystem::file_size("history.mdta") != 0) {
            char temp;
            std::cout << "Do you want to clear the history? [y] for yes or [n] for no\n";
            while (std::cin >> temp) {
                if (temp == 'y') {
                    asmd = 'c';
                    goto clear;
                }
                if (temp == 'n') {
                    break;
                }
                else
                    std::cout << "Please Enter only [y] or [n]:\n";
            }
        }

        static int usage = false;
        if (usage == true) {
            std::cout << "Do you want to quit now? [y] for yes or [n] for no\n";
            char temp;
            while (std::cin >> temp) {
                if (temp == 'y') {
                    asmd = 'q';
                    goto quit;
                }
                if (temp == 'n') {
                    break;
                }
                else {
                    std::cout << "Please enter [y] or [n] only.\n";
                    std::cin.clear();
                }
            }
        }
        usage = true;

        std::cout << "Enter first number of the equation. (1 number!):";

        while (!(std::cin >> double1)) {
            std::cin.clear();
            std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
            std::cout << "The first number was not valid. Please enter only numbers: ";
        }

        std::cout << "Do you want to find the root or a power of the first number?\n";
        std::cout << "Enter [y] for yes or [n] for no\n";
        char check;
        while (std::cin >> check) {
            if (check == 'n') {
                break;
            }
            if (check == 'y') {
                asmd = 's';
                goto end;
            }
            std::cout << "Please only type [y] or [n]\n";
        }

        std::cout << "Add the second number: ";
        while (!(std::cin >> double2)) {
            std::cin.clear();
            std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
            std::cout << "The second number was not valid. Please enter only numbers: ";
        }

        std::cout << " \n";
        std::cout << "[" << double1 << "] [" << double2 << "]\n";
        std::cout << " \n";

        std::cout << "[+][-][*][/][%]\n";
        while (std::cin >> asmd) {
            if (asmd == '+' || asmd == '-' || asmd == '*' || asmd == '/' || asmd == '%') {
                break;
            }
            else {
                std::cout << "Please enter one of the following operations only: [+][-][*][/][%] \n";
                std::cin.clear();
            }
        }
    end:
    quit:
    clear:
        switch (asmd) {
        case  '+':
            adding();
            break;
        case '-':
            subtracting();
            break;
        case '*':
            multiplying();
            break;
        case '/':
            dividing();
            break;
        case 'q':
            return 0;
            break;
        case '%':
            modulo();
            break;
        case 'c':
            clear_history();
            break;
        case 's':
            squareroot_or_powerof();
            break;
        }
    }
    return 0;
}