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Help with sentinel value and loop.

Queso36 (19)
Hello everyone. I am writing a program to convert various temperature types with user input. My program compiles fine, but the values are stored after each loop. How do I reset them for a clean conversion? Also, my program should execute after hitting -999, it doesn't work and I'm not sure why. Any help is appreciated.

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#include <iostream>
#include <string>
#include <iomanip>
using namespace std;

int main()
{
  double C = 0;
  double F = 0;
  double R = 0;
  double K = 0;
  double temperature = 0;
  int temp;

cout << "Enter F for a celcius to fahrenheit conversion.\nEnter K for a celcius to kelvin conversion." << "\nEnter R for fahrenheit to rankine conversion.\nHit -999 to end program.\nEnter C for a celsius temp." << endl;

  while ((temp = cin.get()) != '-999')
    {
	cout << "Enter a temperature to be converted: " << endl;

	switch (temp)
	{
	case 'C':
	case 'c':
	cin >> temperature;
	C += temperature;
	cout << "Celsius" << setw(17) << "Kelvin" << setw(17) << "Fahrenheit" <<
        setw(17) << "Rankine" << endl;
	cout << "----------" << setw(17) << "---------" << setw(17) << "--------   ----" << setw(17) << "--------" << endl;
	cout << C << setw(17) << K << setw(17) << F << setw(17) << R << endl;
	break;

	case 'F':
	case 'f':
	cin >> temperature;
	F = temperature * 9/5 + 32;
	cout << "Celsius" << setw(17) << "Kelvin" << setw(17) << "Fahrenheit" <<
        setw(17) << "Rankine" << endl;
	cout << "----------" << setw(17) << "---------" << setw(17) << "------------" << setw(17) << "--------" << endl;
	cout << C << setw(17) << K << setw(17) << F << setw(17) << R << endl;
	break;

	case 'K':
	case 'k':
	cin >> temperature;
	K = temperature + 273;
	cout << "Celsius" << setw(17) << "Kelvin" << setw(17) << "Fahrenheit" <<
        setw(17) << "Rankine" << endl;
	cout << "----------" << setw(17) << "---------" << setw(17) << "-------------" << setw(17) << "--------" << endl;
	cout << C << setw(17) << K << setw(17) << F << setw(17) << R << endl;
	break;

	case 'R':
	case 'r':
	cin >> temperature;
	R = (F-32) + 491.67;
	cout << "Celsius" << setw(17) << "Kelvin" << setw(17) << "Fahrenheit" << 
        setw(17) << "Rankine" << endl;
	cout << "----------" << setw(17) << "---------" << setw(17) << "-------------" << setw(17) << "--------" << endl;
	cout << C << setw(17) << K << setw(17) << F << setw(17) << R << endl;
	break;

	case '\n':
	case '\t':
	case ' ':
	break;

	default:
	cout << "Incorrect temperature entered." << "Enter a new one" << endl;
	break;
		}
	}
}
gamemaker96 (24)
((temp = cin.get()) != '-999')

should be

temp equals cin.get()

then

if temp !equals -999
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