#include <iostream>#include <iomanip>#include <conio.h>#include <fstream>int addition();int substract();int multiplication();int division();int info();using namespace std;int main(){ int a; system("cls"); cout << "List: " << endl; cout << "1: Addition" << endl << "2: Substraction" << endl << "3: Multiplication" << endl << "4: Division" << endl << "5: Info" << endl << "6: Exit" << endl; cout << "Chose what to do: "; cin >> a; switch(a) { case 1: addition(); break; case 2: substract(); break; case 3: multiplication(); break; case 4: division(); break; case 5: info(); break; case 6: system("pause"); break; default: main(); break; }}int addition(){ int a, b; cout << setw(12) << "Addition" << endl; cout << "First number "; cin >> a; cout << "Second number "; cin >> b; cout << a << " + " << b << " = " << a+b << endl; ofstream myfile; myfile.open ("Calculator.txt",ios::app); myfile << a << " + " << b << "= " << a+b << "\n"; myfile.close(); cout << endl; cout << "Press any key to go back to the menu."; getch(); main();}int substract(){ int a, b; cout << setw(4) << "Substraction" << endl; cout << "First number "; cin >> a; cout << "Second number "; cin >> b; cout << a << " - " << b << " = " << a-b << endl; ofstream myfile; myfile.open ("Calculator.txt",ios::app); myfile << a << " - " << b << "= " << a-b << "\n"; myfile.close(); cout << endl; cout << "Press any key to go back to the menu."; getch(); main();}int multiplication(){ int a, b; cout << setw(4) << "Multiplication" << endl; cout << "First number "; cin >> a; cout << "Second number "; cin >> b; cout << a << " * " << b << " = " << a*b << endl; ofstream myfile; myfile.open ("Calculator.txt",ios::app); myfile << a << " * " << b << "= " << a*b << "\n"; myfile.close(); cout << endl; cout << "Press any key to go back to the menu."; getch(); main(); }int division(){ int a, b; cout << setw(4) << "Division" << endl; cout << "First number "; cin >> a; cout << "Second number "; cin >> b; cout << a << " / " << b << " = " << a/b << endl; ofstream myfile; myfile.open ("Calculator.txt",ios::app); myfile << a << " / " << b << "= " << a/b << "\n"; myfile.close(); cout << endl; cout << "Press any key to go back to the menu."; getch(); main();}int info(){ cout << "At this point the program has a bug when it comes to letters. \nIt has a tendensy to start loop the program or make different calculations\non it's own. \n\nSecond; this program don't have to many options to use several different \nnumbers or operators at once, so instead all your data is saved in a text \ndocument in the same folder as your exe-file is." << endl << endl; cout << "Press any key to go back to the menu."; getch(); main();}