Based on the following code and knowing that recursive calls are allowed, but NO

Question

Based on the following code and knowing that recursive calls are allowed, but NOT forward references

-List potential procedures that could be called by the following procedures

fill in below chart for Main, Sub1, Sub2 and Sub3 based on the program at the bottom:

Again rembember that recursive calls are allowed but NOT forward references.

==========================================

main can call:_______________________________

sub1 can call:_______________________________

sub2 can call:_______________________________

sub3 can call:_______________________________

==========================================

proc main;
var w, x, y, z;

proc sub1;
var x, z;
X := 6; Z := 7;
x :=x + y * z;
end sub1;

proc sub2;
var w, x, y;
w := 11;
subl;
end sub2;

proc sub3;
var w;
w := 1 O; x := w+x; y := x + z + 2;
end sub3;

begin
w := O; x := 1; y := 3; z := 5;
sub2; sub3;

end main.

Explanation / Answer

Answer and explanation:

As per the code:

proc main;
var w, x, y, z;
proc sub1;
var x, z;
X := 6; Z := 7;
x :=x + y * z;
end sub1;
proc sub2;
var w, x, y;
w := 11;
subl;
end sub2;
proc sub3;
var w;
w := 1 O; x := w+x; y := x + z + 2;
end sub3;
begin
w := O; x := 1; y := 3; z := 5;
sub2; sub3;
end main.

in the procedure main:

sub2 and sub3 are getting called in the begin section . But when we call sub2 it is calling sub1 also so main can call sub1,sub2,sub3

in the proceudre sub2 ;sub1 is already getting called s sub2 can call sub1;

sub1 and sub3 cannot call anything as those both are local procedures

so the answer will be:

main can call:___________sub1,sub,2,sub3____________________
sub1 can call:___________nothing____________________
sub2 can call:_________________sub1______________
sub3 can call:________________nothing_______________

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