#include <iostream>
      using namespace std;

      int main()

      {

          float n;

          float a;
 
          float b;          


          cout << "Enter 1 for addition\n";

          cout << "Enter 2 for subtraction\n";

          cout << "Enter 3 for multiplication\n";

          cout << "Enter 4 for division\n";

          cout << "Your choice:   ";
 
          cin  >> n;

         

          if (n==1) {
 
                    cout << "Enter the 1.summand:   ";

                    cin  >> a;

                    cout << "Enter the 2.summand:   ";

                    cin  >> b;

                    cout << a << " + " << b << " = " << a+b << endl;

                    }

          else if (n==2) {

                    cout << "Enter the minuend:   ";

                    cin  >> a;

                    cout << "Enter the subtrahend:   ";
 
                    cin  >> b;

                    cout << a << " - " << b << " = " << a-b << endl;

                    }

          else if (n==3) {
 
                    cout << "Enter the 1.factor:   ";

                    cin  >> a;

                    cout << "Enter the 2.factor:   ";

                    cin  >> b;

                    cout << a << " x " << b << " = " << a*b << endl;

                    }

          else if (n==4) {

                    cout << "Enter the dividend:   ";

                    cin  >> a;

                    cout << "Enter the divisor:   ";

                    cin  >> b;

                    cout << a << " : " << b << " = " << a/b << endl;

                    }

          else {

               cout << "invalid choice" << endl;

               }


          system("PAUSE");

          return 0;
      }