Simple c# calculator

	 int additionFirstNumber = 0;
	 int additionSecondNumber = 0;
	 int substractionFirstNumber = 0;
	 int substractionSecondNumber = 0;
	 int multiplicationFirstNumber = 0;
	 int multiplicationSecondNumber = 0;
	 int divisionFirstNumber = 0;
	 int divisionSecondNumber = 1;
	 int answer = 0;
	 double pi = 3.14;
 int percentaged = 50;
	 int oneHundred = 100;
	 int percentager = 300;
	 
	 Console.WriteLine(additionFirstNumber + additionSecondNumber);
	 Console.WriteLine("addition");
	 
	 Console.WriteLine(substractionFirstNumber - substractionSecondNumber);
	 Console.WriteLine("substraction");
	 
	 Console.WriteLine(multiplicationFirstNumber * multiplicationSecondNumber);
	 Console.WriteLine("multiplication");
	 
	 Console.WriteLine(divisionFirstNumber / divisionSecondNumber);
	 Console.WriteLine("division");
	 
	 Console.WriteLine(answer * pi);
	 Console.WriteLine("pi");

	 Console.WriteLine(percentaged * percentager / oneHundred);
	 Console.WriteLine("percentage");