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

[innocent larki]

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.

[+ M.Tariq Malik]

Please Discuss here about this assignment.Thanks

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.

[salma iqbal]

[sny2ksa]

kindly guide me.

from which lecture is this assignment..?

[salma iqbal]

Lecture 38..

[sny2ksa]

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.

[salma iqbal]

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

IS this true?

[sny2ksa]

yes it is...

[salma iqbal]

 then | E1+E2 should also be BOOLEAN??

[sny2ksa]

it seems.will confirm u soon

[salma iqbal]

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

[sny2ksa]

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

[salma iqbal]

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