Question

QUESTION 1

Consider the following program:

var x = 0;
function sub1() {
   var x = 1;
   function sub2() {
      function sub3() {
         print x;
      }
      sub3();
   }
   function sub4() {
      var x = 2;
      sub2();  
   }
   sub4();
}
sub1();
If this code uses static scoping, when it is executed what is printed?

		0
		1
		2

QUESTION 2

Consider the following program:

var x = 0;
function sub1() {
   var x = 1;
   function sub2() {
      function sub3() {
         print x;
      }
      sub3();
   }
   function sub4() {
      var x = 2;
      sub2();  
   }
   sub4();
}
sub1();
If this code uses dynamic scoping, when it is executed what is printed?

		0
		1
		2

QUESTION 3

Consider the following program:

void fun1 (void);
void fun2 (void);
void fun2 (void);

void main() {
   int a, b, c;
}

void fun1() {
   int b, c, d;
}

void fun2() {
   int c, d, e;
}

void fun3() {
   int d, e, f;
}
and the following call sequence: main calls fun2; fun2 calls fun1; fun1 calls fun3.

Assuming dynamic scoping, what are the variables visible within fun3?

		d, e, and f from fun3
		d, e, and f from fun3; a, b, anc c from main
		d, e, and f from fun3; b and c from fun 1; a from main

QUESTION 4

Consider the following program:

void fun1 (void);
void fun2 (void);
void fun2 (void);

void main() {
   int a, b, c;
}

void fun1() {
   int b, c, d;
}

void fun2() {
   int c, d, e;
}

void fun3() {
   int d, e, f;
}
and the following call sequence: main calls fun1; fun1 calls fun3; fun3 calls fun2.

Assuming dynamic scoping, what are the variables visible within fun2?

		a, b , and c from main; d from fun 1; e and f from fun3
		a from main; b from fun1; f from fun 3; c, d, and e from fun2
		c, d, and e from fun2

Answer 1