primesieve  5.7.2
previous_prime.cpp

Iterate backwards over primes using primesieve::iterator.

#include <primesieve.hpp>
#include <iostream>
int main()
{
it.skipto(2000);
uint64_t prime = it.previous_prime();
// iterate over the primes from 2000 to 1000
for (; prime >= 1000; prime = it.previous_prime())
std::cout << prime << std::endl;
return 0;
}