Looping ????

I  have used looping in C++ before, HOWEVER, I am learning to use public and private classes. If I write my program without class I have no problem using a "do/while" or "if /else" statements. Is the looping funtion different when using public and private class?  I am going to post the code that I am working with below. My request is that you don't fix my code, but add a comment(s) that helps me to learn. If I dont get It I will repost with a more specific question. Thank you much!!!

#include <iostream>

using namespace std;
class temp
{
private:

    static float num1;
    static float num2;
    double numF;
    double numC;

public:

    void inputTempF();
    void calcTemp();
    void displayTempC();
};

float temp::num1 = .555555;
float temp::num2 = 32;

main()
{
temp theTemp;
do
{
theTemp.inputTempF();
theTemp.calcTemp();
theTemp.displayTempC();
}

while
(theTemp.inputTempF()!= 9999);
system("Pause");

}

void temp::inputTempF()
{
    cout << "Please enter a temp in F: ";
    cin >> numF;
    cout << endl;
}

void temp::calcTemp()
{
          numC =(num1*(numF-num2));
}

void temp::displayTempC()
{
cout << "The C temp is "<< numC ;
          cout << endl;
}