primesieve
7.5
prev_prime.cpp
Iterate backwards over primes using
primesieve::iterator
.
#include <
primesieve.hpp
>
#include <iostream>
int
main()
{
primesieve::iterator
it;
it.
skipto
(2000);
uint64_t prime = it.
prev_prime
();
// iterate over primes from 2000 to 1000
for
(; prime >= 1000; prime = it.
prev_prime
())
std::cout << prime << std::endl;
return
0;
}
primesieve.hpp
primesieve C++ API. primesieve is a library for fast prime number generation, in case an error occurs...
primesieve::iterator
primesieve::iterator allows to easily iterate over primes both forwards and backwards.
Definition:
iterator.hpp:32
primesieve::iterator::skipto
void skipto(uint64_t start, uint64_t stop_hint=get_max_stop())
Reset the primesieve iterator to start.
primesieve::iterator::prev_prime
uint64_t prev_prime()
Get the previous prime.
Definition:
iterator.hpp:79
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