int menu(int menuChoice);
	{
	system("cls");
	
	cout<<"Mathematical Operations Menu\n"
		<<"1) Calculate the FACTORIAL of a number\n"
		<<"2) Calculate M raised to the Nth POWER\n"
		<<"3) Calculate the LEAST COMMON MULTIPLE of two numbers\n"
		<<"4) Calculate the GREATEST COMMON DIVISOR of two numbers\n\n"
		<<"5) Exit\n\n"
		<<"Enter your choice: ";
	cin>>menuChoice;
	while(menuChoice > 0 && menuChoice <= 5)
		{
		cout<<"\nError: Invalid Entry, Try again.";
		cin>>menuChoice;
		}
	return menuChoice;
	}