Simple console calc... u___u

#include <iostream>
using namespace std;

class Calculate
  {
    private:
      float calcResult;
    public:
      float add(float, float);
      float subtract(float, float);
      float multiply(float, float);
      float divide(float, float);
  };

float Calculate::add(float x, float y)
  {
    calcResult = x + y;
    return calcResult;
  }

float Calculate::subtract(float x, float y)
  {
    calcResult = x - y;
    return calcResult;
  }

float Calculate::multiply(float x, float y)
  {
    calcResult = x * y;
    return calcResult;
  }

float Calculate::divide(float x, float y)
  {
    calcResult = x / y;
    return calcResult;
  }

int main()
  {
    Calculate calc;
    Calculate *cPtr;
    cPtr = &calc;
    float num1, num2;
    char again;
    int menu;

    do
      {
        cout << "You may choose from any of the following options:\n\n";
        cout << "1. Add\n";
        cout << "2. Subtract\n";
        cout << "3. Multiply\n";
        cout << "4. Divide\n";
        cout << "Please choose one...\n";
        cin >> menu;

        switch(menu)
          {
            case 1:
              cout << "Please enter the first summand:" << endl;
              cin >> num1;
              cout << "Please enter the second summand:" << endl;
              cin >> num2;
              cout << num1 << " plus " << num2 << " equals " << cPtr->add(num1, num2) << endl;
              break;
            case 2:
              cout << "Please enter the minuend:" << endl;
              cin >> num1;
              cout << "Please enter the subtrahend:" << endl;
              cin >> num2;
              cout << num1 << " minus " << num2 << " equals " << cPtr->subtract(num1, num2) << endl;
              break;
            case 3:
              cout << "Please enter the multiplicand:" << endl;
              cin >> num1;
              cout << "Please enter the multiplier:" << endl;
              cin >> num2;
              cout << num1 << " times " << num2 << " equals " << cPtr->multiply(num1, num2) << endl;
              break;
            case 4:
              cout << "Please enter the dividend:" << endl;
              cin >> num1;
              cout << "Please enter the divisor:" << endl;
              cin >> num2;

              if (num2 == 0)
                {
                  cout << "Can't divide by zero!\n";
                  break;
                }
              else
                {
                  cout << num1 << " divided by " << num2 << " equals " << cPtr->divide(num1, num2) << endl;
                  break;
                }
            default:
              cout << "You did not enter 1, 2, 3 or 4!\n";
          }
        cout << "Do you want the program to run again? y/n" << endl;
        cin >> again;
      }
    while (again == 'Y' || again == 'y');

    return 0;
  }