Need help please

[Confusedlabrador]

Hey guys,
My program asks for a physics mark and outputs the mark as a percentage. I'm stuck on making sure that the mark is not below 0 or above 100. I've tried using a for loop, but that doesn't do the trick.

#include "stdafx.h"
#include <iostream>

using namespace std;

int main()
{
	int physics;

	cout << "Please enter your mark for physics: ";
	cin >> physics;
	cout << "\n";

	if (physics > 100 || physics < 0);
	{
		for (;;) 
		{
			cout << "Data value is out of range, please try again.";  
			cout << "\n";
			cout << "Please enter your mark for physics: ";
			cin >> physics;
			cout << "\n";

			if (100 >= physics || physics >= 0);
			{
				break;
			}
		}
		
	}

	if (100 >= physics || physics >= 0);
	{
		cout << "\n";
		cout << "Your physics mark is: " << physics << "%";
		cout << "\n";
	}
	system("pause");
	return 0;
}

[lastchance]

1. See lines 25 and 33.
OR is ||
AND is &&


2. See lines 15 and 33 - remove those semicolons at the ends of the lines or the if blocks will actually be empty and the following lines will always run.