Answer:

python:

def calculator():

   try:

       cal = int(input("enter your first number: "))

   except ValueError:

       print("please enter a number not a word")

       calculator()

   try:

       cal2 = int(input("1: add, 2: subtract, 3: multiply, 4: divide: "))

   except ValueError:

       print("please enter a number not a word")

       calculator()

   try:

       cal3 = int(input("enter your second number: "))

   except ValueError:

       print("please enter a number not a word")

       calculator()

   if cal2 == 1:

       r = cal + cal3

   elif cal2 == 2:

       r = cal - cal3

   elif cal2 == 3:

       r = cal * cal3

   elif cal2 == 4:

       r = cal / cal3

   else:

       print("number not in list")

       calculator()

   print(r)

   qus = input("do you want to repeat?(y/n): ")

   if qus == 'y':

       calculator()

   else:

       exit(0)

C++:

#include <iostream>

using namespace std;

int main() {

   int a;

   int b;

   int c;

   cout << "enter your first number ";

   cin >> a;

   cout << "enter your second number ";

   cin >> b;

   cout << "enter operator: 1: add, 2: subtract, 3: multiply, 4: divide ";

   cin >> c;

   if (c < 2) {

       cout << "it is " << a + b;

   } else if (c < 3) {

       cout << "it is " << a - b;

   } else if (c < 4) {

       cout << "it is " << a * b;

   } else if (c < 5) {

       cout << "it is " << a / b;

   } else {

       cout << "it is not in the list.";

   }

   return 0;

}