Problem Calling Destructor, and prob with cin.

EDIT::: i fixed the problem with the contructor

However, cin automaticly moves to the next line after input. Is there a way i can make Cin stay on the same line, so i can use the +, -, *, and / characters after it? Compile the code and you'll see what i mean.

CODE:

Code:

#include <iostream>
#include <stdlib.h>

class calc
{
 private:
    long double *num;
      
 public:
      calc();
      ~calc();
      void getnum();
      
      long double  numreturn(){ return *num;} //returns number to print on screen//
};


calc::calc()
{
 num = new long double;
}

calc::~calc()
{
 delete num;
}

void calc::getnum()
{
 calc();
 cin>> *num;
}


int main(int argc, char *argv[])
{ 
 int choose = 0, loop = 0;                     
 calc num1, num2;//Instances hold the 2 numbers used in them math//                               
 cout<<"Type the number of what you want to do, then press [ENTER]\n\n";
 cout<<"1..........Addition\n"                 //The menu//
       "2..........Subtraction\n"
       "3..........Multiplication\n"
       "4..........Division\n\n"
       "5..........End Program\n\n\n";
       
 
                     do{
 cout<<"What do you want to do? ";
 cin>>choose;
 switch(choose)                     
 {
  case 1:
   {
    cout<<"Addition\n";
    num1.getnum(); cout<<" + ";  num2.getnum(); cout<<" = "<<num1.numreturn() + num2.numreturn();
    break;
   }
  case 2:
   {
    cout<<"Subtraction\n";
    num1.getnum(); cout<<" - ";  num2.getnum(); cout<<" = "<<num1.numreturn() - num2.numreturn();
    break;
   }
  case 3:
   {
    cout<<"Multiplication\n";
    num1.getnum(); cout<<" * ";  num2.getnum(); cout<<" = "<<num1.numreturn() * num2.numreturn();
    break;     
   }
  case 4:
   { 
    cout<<"Division\n";
    num1.getnum(); cout<<" / ";  num2.getnum(); cout<<" = "<<num1.numreturn() / num2.numreturn();
    break;
   }
  case 5:
   {
    cout<<"Program Closing\n\n\n\n";
    loop = 1;
    num1.~calc(); num2.~calc();
    break;
   }
  default:
   {
    cout<<"Not a choice, program returning to Menu\n\n";
    break;
   }
 }
                        }
 while(loop == 0);
  
  system("PAUSE");	
  return 0;
}

EDIT:: Fixed problem with contstructor.

I know this is alot of code for a Command line calculator but its i only made it to help me understand pointers and classes better.