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; }
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; }
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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