oneMillionPrime.c

oneMillionPrime.c

#include <stdio.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>

#include <math.h>
#define MAX 1000000000

int main()
{
	bool *state = (bool *)malloc(sizeof(bool) * (MAX+1));
	int64_t sq = sqrt(MAX);

	for(int64_t i = 2; i<= sq; ++ i)
	{
		if(!state[i])
		{
			for(int64_t j = i*i; j <= MAX; j += i) {
				state[j] = true;
			}
		}
	}

	int64_t num = 0, sum = 0;
	for(int64_t i = 2; i <= MAX; ++ i)
	{	
		if(!state[i]) {
			num ++;
			sum += i;
		}
	}
	free(state);

	printf("num = %lld, sum = %lld\n ", num, sum);
	return 0;
}