Problem 3. Parameter Passing Consider the following block. Assume dynamic scoping. 1 ( int y; 2 int z; 3 4 e 5 6 7 8 e 9 10 11 12 13 14 15 }; y := 6; { int }; f(int a) { y = a +1; return (y+a) }; int g(int x) { y = f(x+1)+2; z = f(x-y+2); return (z+1) } z = g(y*2); a) Draw the runtime stack after each line executes given that both parameters a and x are passed using Call-by-Name. What are the values of y and z after line 13 executes? b) Draw the runtime stack after each line executes given that both parameters a and x are passed using Call-by-Need. What are the values of y and z after line 13 executes?
Problem 3. Parameter Passing Consider the following block. Assume dynamic scoping. 1 ( int y; 2 int z; 3 4 e 5 6 7 8 e 9 10 11 12 13 14 15 }; y := 6; { int }; f(int a) { y = a +1; return (y+a) }; int g(int x) { y = f(x+1)+2; z = f(x-y+2); return (z+1) } z = g(y*2); a) Draw the runtime stack after each line executes given that both parameters a and x are passed using Call-by-Name. What are the values of y and z after line 13 executes? b) Draw the runtime stack after each line executes given that both parameters a and x are passed using Call-by-Need. What are the values of y and z after line 13 executes?
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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![Problem 3. Parameter Passing
Consider the following block. Assume dynamic scoping.
1 = {
2
3
4 e
5
LO
01
7
8
9
10
11
12
13
14
15
};
int y;
int z;
y = 6;
{ int f(int a) {
};
y := a+1;
return (y+a)
};
int g(int x) {
y = f(x+1)+2;
z = f(x-y+2);
return (z+1)
}
Z := g(y*2);
a) Draw the runtime stack after each line executes given that both parameters a and x are passed
using Call-by-Name. What are the values of y and z after line 13 executes?
b) Draw the runtime stack after each line executes given that both parameters a and x are passed
using Call-by-Need. What are the values of y and z after line 13 executes?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F72b2fd36-0557-47bc-b4e6-10a8158b2129%2F9e4c216b-05c6-4bfa-8f9e-ffc2bf3fa0e4%2Fmu2mwmk_processed.png&w=3840&q=75)
Transcribed Image Text:Problem 3. Parameter Passing
Consider the following block. Assume dynamic scoping.
1 = {
2
3
4 e
5
LO
01
7
8
9
10
11
12
13
14
15
};
int y;
int z;
y = 6;
{ int f(int a) {
};
y := a+1;
return (y+a)
};
int g(int x) {
y = f(x+1)+2;
z = f(x-y+2);
return (z+1)
}
Z := g(y*2);
a) Draw the runtime stack after each line executes given that both parameters a and x are passed
using Call-by-Name. What are the values of y and z after line 13 executes?
b) Draw the runtime stack after each line executes given that both parameters a and x are passed
using Call-by-Need. What are the values of y and z after line 13 executes?
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