public void op0()
	{
		if(have(Token.Kind.GREATER_EQUAL))
			expectRetrieve(Token.Kind.GREATER_EQUAL);
		else if(have(Token.Kind.LESSER_EQUAL))
			expectRetrieve(Token.Kind.LESSER_EQUAL);
		else if(have(Token.Kind.NOT_EQUAL))
			expectRetrieve(Token.Kind.NOT_EQUAL);
		else if(have(Token.Kind.EQUAL))
			expect(Token.Kind.EQUAL);
		else if(have(Token.Kind.GREATER_THAN))
			expectRetrieve(Token.Kind.GREATER_THAN);
		else if(have(Token.Kind.LESS_THAN))
			expectRetrieve(Token.Kind.LESS_THAN);
		else
			System.out.println("Something wrong in op0");
	}