liet ke so nguyen to tu 2 den N

#include "stdio.h"
#include "conio.h"

int so_nguyen_to(int N);
int main() {
  int N, i;

  do {
    printf("\n Nhap vao so N = ");
    scanf("%d", & N);
  }
  while (N <= 0);
  printf("\n Cac so nguyen to nho hon %d :", N);
  for (i = 2; i <= N; i++) {
    if (so_nguyen_to(i))
      printf(" %d ", i);
  }
  getch();
}

// Ham kiem tra so nguyen to
int so_nguyen_to(int N) {
  int i;
  if (N == 2)
    return 1;
  else {
    for (i = 2; i < N; i++) {
      if (N % i == 0)
        return 0;
    }
    return 1;
  }
}