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# CS606 Assignment No 04 Solution & Discussion Due Date:05-02-2013

Question No 1: Marks 20
Consider the following grammar productions. Suppose you have an attribute E.type which can
be set to either INT, BOOL. Assume that the type of an expression is set to INT if an error is
detected and you have a routine msg() similar to printf() that can be used to print error
message.
E → CONST {E.type=??}
| ID {E.type =getType(ID.name);}
| E1 +E2 {E.type=??}
| E1< E2 {E.type=??}
| E1= =E2 {E.type=??}
| (E1) {E.type=??}
You are required to add rules to the attribute grammar to calculate E.type for each grammar
production.

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### Replies to This Discussion

Our main purpose here discussion not just Solution

We are here with you hands in hands to facilitate your learning and do not appreciate the idea of copying or replicating solutions.

kindly guide me.

from which lecture is this assignment..?

Lecture 38..

what i can understand in it that this assignment relates to "type checking".

but still don't know the solution.

it can be like this.

 | E1< E2 {E.type=BOOL}

but what will be next.

having no idea.

kindly share yout ideas.

come all,will discuss and solve it.

| E1= =E2                                         {E.type=ASSIGNMENT}

IS this true?

yes it is...

then | E1+E2 should also be BOOLEAN??

it seems.will confirm u soon

ok..in handouts on Page 111 expression E---> (E1) has beenn mentioned..bt not getting it..kindly confirm it too..Is this also boolean??

actually i am not according to scheduled lectures and started late to work on this assignment.let me listen lecture first.

ok i am also working on it..@Sweet Heart..plzz confirm it 100%...:)

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