Kalner

So I noticed that both for and while loops have a infinite loop option, is there any difference between them? 

Say I have a switch statement with certain parameters, but when someone doesn't input what it ask's, I want the default to go back to the switch statement instead of making another one.

Just asking if it is possible to declare variables outside int main, any functions and outisde classes?

So today I was getting into reading more on classes and I read on classes in seperate files and it was like Myclass::Myclass or something

so.. what does the "::" mean??

So, yesterday I started making a geuss the number game and there was a problem that if you geussed it right it would show a loss.I tried today of using classes for losses instead of a bunch of code in the if and else curly brackets. Now even with class's I still get an error. Is there some kind of prblem with my if statement or is there a problem when an if statement is in a switch?

#include <iostream>
#include <string>
#include <ctime>
#include <cstdlib>
using namespace std;
class Win{
    public:
	    void setWin(string x){
		    win = x;
	    }
	    string getWin(){
		    return win;
	    }
    private:
	    string win;
};
class Loss{
    public:
	    void setLoss(string z){
		    loss = z;
	    }
	    string getLoss(){
		    return loss;
	    }
    private:
	    string loss;
};
int main()
{
  int number;
  char gn;
  char dif;
  srand(time(0));
  Win wo;
  wo.setWin("You Won!");
  Loss lo;
  lo.setLoss("You Lost, the number was ");
    cout << "Welcome to Guess The Number 3.0" << endl;
    cout << "Please choose your difficluty. E = Easy M= Medium H = Hard" << endl;
    cin >> dif;
	    switch(dif){
		    case 'e':
		    case 'E':
				 number = 1+(rand()%10);
				    cout << "Guess a number beetween 1 and 10" << endl;
				    cin >> gn;
				    if(gn == number){
						 cout << wo.getWin() <<endl;
						 system("PAUSE");
				    }
				    else{
					    lo.getLoss() << number << endl;
					    system("PAUSE");

This is 1/3 of the whole program.