primesieve
5.7.2
count_primes.c
C program that shows how to count primes.
#include <
primesieve.h
>
#include <inttypes.h>
#include <stdio.h>
int
main()
{
uint64_t count =
primesieve_count_primes
(0, 1000);
printf(
"Primes below 1000 = %"
PRIu64
"\n"
, count);
/* use multi-threading for large intervals */
count =
primesieve_parallel_count_primes
(0, 1000000000);
printf(
"Primes below 10^9 = %"
PRIu64
"\n"
, count);
return
0;
}
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