eratosthenes with Clang

eratosthenes.c

#include <stdio.h>
#include <math.h>

#define NUM 100000

int main(void) {
  int prime[NUM + 1];
  int i, j, Limit;

  for (i=2; i <= NUM; i++) {
    prime[i] = 1;
  }

  Limit = (int)sqrt((double)NUM);
  for (i=2; i <= Limit; i++) {
    if (prime[i] == 1) {
      for (j=i*2; j <= NUM; j++) {
        if (j % i == 0) {
          prime[j] = 0;
        }
      }
    }
  }
  for (i = 2; i <= NUM; i++ ) {
    if (prime[i] == 1) {
      printf("%d", i);
      printf("\n");
    }
  }
  printf("\n");
}