ssss.cpp

来自「随机数写如文件」· C++ 代码 · 共 50 行

#include<iostream.h>
#include <ctime> 
#include "fstream.h"  
#include <cstdlib>
#include <math.h>

main(){
double b[100000];
double c[100000];
long  i;
for(i=0;i<=99999;i++)
	b[i]=(i+2);



double m,n,z=0;
double k;
int x;








ofstream   out("test.txt");   

if(!out){cout<<"cannot   write   test   file";return   1;} 

{
	out<<"素数有以下："<<endl;
	
int num=100000;
for(i=0;i<num;i++)
	{	k=sqrt(b[i]);
	for(n=2;n<=k;n++)
		if(int(b[i]/n)==0) break;
		if(n>=k+1){cout<<b[i]<<endl;out<<b[i]<<endl;z=z+1;}
	}

cout<<"NUM IS"<<endl;;cout<<z<<endl;

	out<<"共有素数"<<z<<"个"<<endl;
}




}