【ACM】How many prime numbers

http://acm.hdu.edu.cn/game/entry/problem/show.php?chapterid=2&sectionid=1&problemid=2

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

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[]) {
	int f,s,n,i,m;

	while( scanf( "%d" , &n) != EOF ) {
		s = 0 ;
		while( n-- ) {
			scanf( "%d" , &m );
			f = 0;
			for( i = 2; i <= sqrt( m * 1.0) ; i++ ) { /*统计素数个数 */
				if( 0 == m % i   ) {          /*素数是除了1和本身能整除的数 如果到sqrt(m*1.0) 还不能整除就是素数*/
					f = 1 ;
					break ;
				}
			}
			if ( 0 == f ) s++ ;
		}
		printf( "%d\n" , s );
	}

	return 0;
}