public static void sketch(int x1, int y1, int x2, int y2, int n) ( if (n <= 0) drawLine(x1, y1, x2, y2); else { int xm (x1 + x2 + y1 - y2) / 2; int ym (y1+ y2 + x2-x1) / 2; sketch(x1, y1, xm, ym, n - 1); sketch(xm, ym, x2, y2, n - 1); W } Assume that the screen looks like a Cartesian coordinate system with the origin at the center, and that drawLine connects (x1,y1) to (x2,y2). Assume also that x1, y1, x2, and y2 are never too large or too small to cause errors. Which picture best represents the sketch drawn by the method call sketch(a, 0, -a, 0, 2) where a is a positive integer?

public static void sketch(int x1, int y1, int x2, int y2, int n) ( if (n <= 0) drawLine(x1, y1, x2, y2); else { int xm (x1 + x2 + y1 - y2) / 2; int ym (y1+ y2 + x2-x1) / 2; sketch(x1, y1, xm, ym, n - 1); sketch(xm, ym, x2, y2, n - 1); W } Assume that the screen looks like a Cartesian coordinate system with the origin at the center, and that drawLine connects (x1,y1) to (x2,y2). Assume also that x1, y1, x2, and y2 are never too large or too small to cause errors. Which picture best represents the sketch drawn by the method call sketch(a, 0, -a, 0, 2) where a is a positive integer?

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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Question

21. Consider the following method:
public static void sketch(int x1, int y1, int x2, int y2, int n)
(
if (n <= 0)
O
else
(
}
drawLine(x1, y1, x2, y2);
Assume that the screen looks like a Cartesian coordinate
system with the origin at the center, and that drawLine
connects (x1,y1) to (x2,y2). Assume also that x1, y1, x2,
and y2 are never too large or too small to cause errors.
Which picture best represents the sketch drawn by the
method call
int xm
(x1 + x2 + y1 - y2) / 2;
int ym (y1 + y2 + x2-x1) / 2;
sketch(x1, y1, xm, ym, n - 1);
sketch (xm, ym, x2, y2, n - 1);
sketch(a, 0, -a, 0, 2)
where a is a positive integer?
(A)
<-a
y
-a
y
a
X
(B)
(D)
-a
-a
y
+
-a
-a
a

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