Answer to Question #176717 in C++ for Muhammad Ahmed

Question

Create a calculator for the number by creating a class of number with overloading all operators in it.(Operators: ++,--,+,-,/,*, >>, <<).

Answer 1

#include <iostream>

using namespace std;


class Number
{
private:

  float _num;

public:

  void SetNum(float number)
  {
    _num = number;
  }

  float GetNum() const
  {
    return _num;
  }

  Number& operator++()
  {
    this->SetNum(GetNum()+1);
    return *this;
  }

  Number& operator--()
  {
    this->SetNum(GetNum()-1);
    return *this;
  }

  Number& operator=(const Number &numToAssign)
  {
    this->SetNum(numToAssign.GetNum());
    return *this;
  }

  Number operator+(const Number &numToAdd)
  {
    this->SetNum(this->GetNum() + numToAdd.GetNum());
    return *this;
  }

  Number operator-(const Number &numToAdd)
  {
    this->SetNum(this->GetNum() - numToAdd.GetNum());
    return *this;
  }

  Number operator*(const Number &numToAdd)
  {
    this->SetNum(this->GetNum() * numToAdd.GetNum());
    return *this;
  }

  Number operator/(const Number &numToAdd)
  {
    this->SetNum(this->GetNum() / numToAdd.GetNum());
    return *this;
  }

   friend ostream& operator<< (ostream &out, const Number &number)
   {
     out << number._num;
     return out;
   }

   friend istream& operator>> (istream &in, Number &number)
   {
     in >> number._num;
     return in;
   }
};



int main()
{
  int choice;
  Number number1, number2;

  cout << "Enter 1 to sum 2 Numbers"
    << "\nEnter 2 to difference 2 Numbers"
    << "\nEnter 3 to multiply 2 Numbers"
    << "\nEnter 4 to divide 2 Numbers"
    << "\nEnter 5 to increase Number by 1"
    << "\nEnter 6 to decrease Number by 1"
    << "\nEnter 0 To Exit"
    << "\n";
  do {
    cout << "\nChoose the operation: ";
    cin >> choice;
    switch (choice)
    {
    case 1:
      cout << "Please enter the first number: ";
      cin >> number1;
      cout << "Please enter the second number: ";
      cin >> number2;
      cout << "Result: " << number1 + number2 << endl;
      break;
    case 2:
      cout << "Please enter the first number: ";
      cin >> number1;
      cout << "Please enter the second number: ";
      cin >> number2;
      cout << "Result: " << number1 - number2 << endl;
      break;
    case 3:
      cout << "Please enter the first number: ";
      cin >> number1;
      cout << "Please enter the second number: ";
      cin >> number2;
      cout << "Result: " << number1 * number2 << endl;
      break;
    case 4:
      cout << "Please enter the first number: ";
      cin >> number1;
      while(number2.GetNum() == 0)
      {
        cout << "Please enter the second number(not 0): ";
        cin >> number2;
      }
      cout << "Result: " << number1/number2 << endl;
      break;
    case 5:
      cout << "Please enter the number: ";
      cin >> number1;
      cout << "Result: " << ++number1 << endl;
      break;
    case 6:
      cout << "Please enter the number: ";
      cin >> number1;
      cout << "Result: " << --number1 << endl;
      break;
    }
  } while (choice >= 1 && choice <= 6);

return 0;
}