Answered: C++ What is the code below doing? Find…

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

C++

What is the code below doing? Find the short code can replace its function (For example: sort, replace, search, ...)

int* Algorithm1(int limit)
{
bool* sieve = new bool[limit >> 1];
for (int i = 0; i < sizeof(sieve) / sizeof(sieve[0]); i++) sieve[i] = true;
for (int p = 3, s = 9; s < limit; p += 2)
{
if (sieve[p >> 1])
{
for (int q = s; q < limit; q += p << 1)
sieve[q >> 1] = false;
}
s += (p + 1) << 2;
}
int* primes = new int[sizeof(sieve) / sizeof(sieve[0])];
if (limit > 2)
primes[0] = 2;
for (int i = 1; i < sieve.size(); ++i)
{
if (sieve[i])
primes.push_back((i << 1) + 1);
}
return primes;
}

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