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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Consider the following block. Assume dynamic scoping.
int yi
int z;
1 e{
2
3
4 a
01234
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?
Transcribed Image Text:Consider the following block. Assume dynamic scoping. int yi int z; 1 e{ 2 3 4 a 01234 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?
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