primesieve 12.1
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count_primes.c

C program that shows how to count primes.

C program that shows how to count primes.

#include <primesieve.h>
#include <inttypes.h>
#include <stdio.h>
int main(void)
{
uint64_t count = primesieve_count_primes(0, 1000);
printf("Primes <= 1000: %" PRIu64 "\n", count);
return 0;
}
primesieve C API.
uint64_t primesieve_count_primes(uint64_t start, uint64_t stop)
Count the primes within the interval [start, stop].