cant resolve operators

[yaroj]

		double current = 0;
		current += 100000;
		current *=0.9;
		long testLong = 1234;
		testLong += 420;
		testLong /= 13;
		testLong++;
		Console.WriteLine(current);
		Console.WriteLine(testLong);
		int t = 13;
		t++;
		t+=406;
		Console.WriteLine(t);

consulo cant resolve many different operators