Seminarium 3

##Seminarium 3

##Uppgift 1
    pass
    print

file_input
    |                    |
statement            statement
    |                    |
stmt_list            stmt_list
    |                    |
simple_stmt            simple_stmt
    |                    |
pass_stmt            print_stmt
    |                    |
   pass                print


##Uppgift 2
   x + 3 * -y

a_expr
    |
a_expr       "+"    m_expr
    |              |
m_expr            m_expr    "*"  u_expr
    |              |                 |
u_expr            u_expr       "-"    u_expr
    |              |                  |
power            power            power
    |              |                  |
primary            primary            primary
    |              |                  |
atom            atom            atom
    |              |                  |
identifier        literal            identifier
    |              |                  |
letter            integer            letter
    |              |                  |
lowercase     decimalinteger        lowercase
    |              |                  |
    x            digit              y
                  |
                  3


##Uppgift 3
    myint = x + 3 * -y

assignment_stmt
       |
  targets_list                 "="                             expression_list
       |                                                           |
    target                                                     expression
       |                                                           |
   identifier                                                  conditional_expression
       |                                                           |
    letter "+" letter "+"  letter "+"  letter "+ " letter       or_test
       |          |           |           |           |            |
  lowercase  lowercase   lowercase   lowercase   lowercase      and_test
       |          |           |           |           |            |
       m          y           i           n           t         not_test
                                                                   |
                                                                comparison
                                                                   |
                                                                or_expr
                                                                   |
                                                                xor_expr
                                                                   |
                                                                and_expr
                                                                   |
                                                                shift_expr
                                                                   |
                                                                a_expr