p61_2_31.cpp

习题,都是习题

//homework
#include <iostream.h>
#include <math.h>
void main()
{
	int x;
	int i;
	
	cout<<1<<"是质数"<<endl<<2<<"是质数"<<endl<<3<<"是质数"<<endl<<5<<"是质数"<<endl<<7<<"是质数"<<endl;
	for (x=1;x<=100;x+=2)
		for (i=2;i<sqrt(x);i++)
		{
		    if (x%i!=0&&x%1==0&&x%x==0&&x%3!=0&&x%5!=0&&x%7!=0)
			cout<<x<<endl;
			break;
			
		}
}