/* This program provides a simple 4-function calculator.

  ===> ENTER YOUR DOCUMENTATION HERE
 
   Input:  a char, stored in operation;
           two reals, stored in op1 and op2;
   Output: the result of the expression (op1 operation op2).
--------------------------------------------------------------*/

#include <iostream>         // cin, cout, <<, >>
#include <string>           // string
#include <cassert>          // assert()
using namespace std;

int main()
{
  //*** ENTER YOUR OPENING OUTPUT STATEMENT(S) HERE

  const string MENU = "\nPlease enter:\n"
                      "\t+, to perform addition;\n"
	              "\t-, to perform subtraction;\n"
                      "\t*, to perform multiplication;\n"
                      "\t/, to perform division;\n"
                      "--> ";

  cout << MENU;
  char operation;
  cin >> operation;

  assert(operation == '+' || operation == '-' ||
         operation == '*' || operation == '/');

  cout << "\nNow enter your operands: ";
  double op1, op2, result;
  cin >> op1 >> op2;
  
  /***/ CALCULATE THE RESULT OF op1 operation op2
  
  cout << endl << op1 << operation << op2
       << " = " << result << endl;
}