判断素数

#include <math.h>

bool IsSushu(int n)
{
	bool IsSushuFlg = true;

	if( n <= 1)
	{
		return false;
	}

	for( int i = 2; i <= (int)sqrt((double)n); i++ )
	{
		if( 0 == n % i )
		{
			IsSushuFlg = false;
			break;
		}
	}

	return IsSushuFlg;
}