Show the symbol table for the following C programs at the print lines using (a)

Question

Show the symbol table for the following C programs at the print lines using (a) the lexical scope and (b) the dynamic scope.

What does the program print using each kind of scope rule?

Program 1:

const int b = 10;

int foo()

{

   int a = b + 10;

   return a;

}

int bar()

{

   int b = 4;

   return foo();

}

int main()

{

   printf(“foo = %d ”,foo());

   printf(“bar = %d ”,bar());

   return 0;

}

Program 2:

int a;

void first()
{
   a = 12
}

void second()

{
int a = 6;
first();
}

void main()

{
a = 4;

second();

printf("%d ",a);
}

Explanation / Answer

Program 1:

const int b = 10;   

int foo()

{

   int a = b + 10;

   return a;

}

int bar()

{

   int b = 4;

   return foo();

}

int main()

{

   printf(“foo = %d ”,foo()); //prints 20//   

   printf(“bar = %d ”,bar()); //prints 20//

   return 0;

}

Static(lexical) scoping : Prints 20

prints 20

Dynamic scoping : prints 20

prints 14

Symbol Name

Type

Scope

foo

function,int

global

bar

function,int

global

a

int

block local

b

int,const

Global,block local

Program 2:

int a;

void first()
{
   a = 12;
}

void second()

{
int a = 6;
first();
}

void main()

{
a = 4;

second();

printf("%d ",a);
}

Static(lexical) scoping : Prints a:12

Dynamic scoping : prints a:12

Symbol Name

Type

Scope

first

function

global

second

function

global

a

int

block local,global

Symbol Name

Type

Scope

foo

function,int

global

bar

function,int

global

a

int

block local

b

int,const

Global,block local

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