#include <iostream>#include <conio.h>using namespace std;void Add();void Sub();void Mul();void Div();void Hello();void Message();int main()...{ int i = 0; while (true) ...{ Message(); cout << "please input youre choice: " << endl; cin >> i; switch (i) ...{ case 0: cout << "welcome next time!" << endl; return 0; case 1: Add(); break; case 2: Sub(); break; case 3: Mul(); break; case 4: Div(); break; case 5: Hello(); break; default: cout << "please input a correct number (0 ~ 5)." << endl; break; } cout << "press any key to continue...." << endl; getche(); } return 0;}void Add()...{ int a = 0; int b = 0; cout << "execute add()" << endl; cout << "please input a: " << endl; cin >> a; cout << "Please input b: " << endl; cin >> b; cout << "a + b = " << a + b << endl;}void Sub()...{ int a = 0; int b = 0; cout << "execute sub()" << endl; cout << "please input a: " << endl; cin >> a; cout << "Please input b: " << endl; cin >> b; cout << "a - b = " << a - b << endl;}void Mul()...{ int a = 0; int b = 0; cout << "execute mul()" << endl; cout << "please input a: " << endl; cin >> a; cout << "Please input b: " << endl; cin >> b; cout << "a * b = " << a * b << endl;}void Div()...{ int a = 0; int b = 0; cout << "execute div() " << endl; cout << "please input a: " << endl; cin >> a; cout << "Please input b: " << endl; cin >> b; cout << "a / b = " << a / b << endl;}void Hello()...{ cout << "hello, consumer" << endl;}void Message()...{ cout << endl; cout << "-----------------------------------------------------------------------" << endl; cout << "0. exit" << endl; cout << "1. add()" << endl; cout << "2. sub()" << endl; cout << "3. mul()" << endl; cout << "4. div()" << endl; cout << "5. hello() " << endl; cout << "-----------------------------------------------------------------------" << endl;}