prime_numbers.cpp File Reference

Get list of prime numbers. More...

#include <iostream>
#include <vector>

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Functions
std::vector< int >	primes (int max)
int	main ()

Detailed Description

Get list of prime numbers.

See also

primes_up_to_billion.cpp sieve_of_eratosthenes.cpp

Function Documentation

main()

int main

(

)

main function

           {
    std::cout << "Calculate primes up to:\n>> ";
    int n;
    std::cin >> n;
    std::vector<int> ans = primes(n);
    for (int i = 0; i < ans.size(); i++) std::cout << ans[i] << ' ';
    std::cout << std::endl;
}

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primes()

std::vector<int> primes

(

int

max

)

Generate an increasingly large number of primes and store in a list

                               {
    max++;
    std::vector<int> res;
    std::vector<bool> numbers(max, false);
    for (int i = 2; i < max; i++) {
        if (!numbers[i]) {
            for (int j = i; j < max; j += i) numbers[j] = true;
            res.push_back(i);
        }
    }
    return res;
}

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