public static void merge ( int[] arrayA, int sizeA, int[] arrayB, int sizeB, int[] arrayC ) { int aDex=0, bDex=0, cDex=0; while (aDex < sizeA && bDex < sizeB) if( arrayA[aDex] < arrayB[bDex] ) arrayC[cDex++] = arrayA[aDex++]; %3D else arrayC[cDex++] = arrayB[bDex++] ; while (aDex < sizeA) arrayC[cDex++] = arrayA[aDex++] ; while (bDex < sizeB) arrayC[cDex++] = arrayB[bDex++]; %3D

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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The heart of the mergesort algorithm involves merging two already sorted arrays. The following method merges two presorted arrays (A and B) into an empty array (C).  Describe the purpose of the 2nd and 3rd while loops (lines 31-35). 

18
19
public static void merge ( int[] arrayA, int sizeA,
int [] arrayB, int sizeB,
int[] arrayC )
20
21
{
int aDex=0, bDex=0, cDex=0;
23
24
25
while (aDex < sizeA && bDex < sizeB)
if( arrayA[aDex] < arrayB[bDex] )
arrayC[cDex++] = arrayA[aDex++];
26
27
28
else
29
arrayC[cDex++] = arrayB [bDex++] ;
while (aDex < sizeA)
arrayC[cDex++] = arrayA[aDex++];
31
32
33
34
while (bDex < sizeB)
35
arrayC[cDex++] = arrayB [bDex++] ;
}
36
N N NN
N M M M M m33
Transcribed Image Text:18 19 public static void merge ( int[] arrayA, int sizeA, int [] arrayB, int sizeB, int[] arrayC ) 20 21 { int aDex=0, bDex=0, cDex=0; 23 24 25 while (aDex < sizeA && bDex < sizeB) if( arrayA[aDex] < arrayB[bDex] ) arrayC[cDex++] = arrayA[aDex++]; 26 27 28 else 29 arrayC[cDex++] = arrayB [bDex++] ; while (aDex < sizeA) arrayC[cDex++] = arrayA[aDex++]; 31 32 33 34 while (bDex < sizeB) 35 arrayC[cDex++] = arrayB [bDex++] ; } 36 N N NN N M M M M m33
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