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Statements and Expressions as structurs in Prolog

Statements and Expressions as structurs in Prolog

Statements and Expressions as structurs in Prolog

Anybody out there who can help me?

The following grammatic discribes a small language for Statements and Expressions as structurs in Prolog.

    statement(if, Predicat, Statement) |
    statement(while, Predicat, Statement) |
    statement(assign, Describ, Expression)
    statement(print, Expression) |
    statement(sequence, Statement, Statement).
Expression ::
    Describ |
    Zahl |
    expression(add, Expression, Expression)|
    expression(sub, Expression, Expression)|
    expression(mult, Expression, Expression).

mit atom(Describ) und number(Number).

Example for an expression: expression(add,x,1)
Example for an statement: statement(assign,x,2.2222).

I have to implement the following predicats:

exec(Statement, Variablelist, NewVariablelist)
eval(Expression, Value, Variablelist)

they should interpret. Statements and Expressions.

there are 5 different ones of Statements and Expressions:


 statement(if, 2, statement(print,2))
describes the tree:
                      /     |      \
                    if      2      statement
                                     |       \
                                   print      2

please help me!

thanx, Andreas

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