Print prime number between 2 and n.c

#include <stdio.h>
int main()
{
    int i, flag = 1, n, newn;
    printf("Enter a number");
    scanf("%d", &n);
    for (newn = 2; newn <= n; newn++)
    {
        flag = 1;
        for (i = 2; i <= newn / 2; i++)
        {
            if (newn % i == 0)
            {
                flag = 0;
                break;
            }
        }
        if (flag == 1)
        {
            printf("%d ", newn);
        }
    }
}