并行计算实现判断一个数是不是素数--Win32和.Net两种方式结合

// Win32D.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <windows.h>
#include <process.h>
#include <math.h>
#include <iostream>
#include <fstream>
using namespace std;
int m;
float c;
int flag=0;
int c2;
HANDLE Thread1,Thread2;
void StartThread1(LPVOID param)
{
	for(int i=1;i<=m;i+=2)
	{
		if(flag==0)
		{
			if(c2%i==0&&i!=1)
				flag=1;
		}
		else
			break;
	}
}

void StartThread2(LPVOID param)
{
	for(int j=2;j<=m;j+=2)
	{
		if(flag==0)
		{
			if(c2%j==0)
				flag=1;
		}
		else
			break;
	}
}


int _tmain(int argc, _TCHAR* argv[])
{
	cin>>c;
	m=sqrt(c);
	c2=(int)c;
	Thread1=CreateEvent(NULL,FALSE,FALSE,NULL);
	//cout<<"1"<<endl;
	Thread2=CreateEvent(NULL,FALSE,FALSE,NULL);
	//cout<<"2"<<endl;
	_beginthread(StartThread1,0,NULL);
	//cout<<"3"<<endl;
	_beginthread(StartThread2,0,NULL);
	//cout<<"4"<<endl;
	//WaitForSingleObject(Thread2,INFINITE);
	cout<<"5"<<endl;
	if(flag==0)
		cout<<"是素数"<<endl;
	else 
		cout<<"不是素数"<<endl;
	cin>>c;//保留输出框
	return 0;
}
/*
    .NET并行判断一个数是不是素数
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
namespace DotNetWyYt
{
    class Program
    {
        public static int m;
        public static int c;
        public static int flag = 0;
        public static int c2;
        public  static void WithDraw1()
        {
            for (int i = 1; i <= m; i += 2)
            {
                if (flag == 0)
                {
                    if (c2 % i == 0 && i != 1)
                        flag = 1;
                }
                else
                    break;
            }
        }
        public static void WithDraw2()
        {
            for (int j = 2; j <= m; j += 2)
            {
                if (flag == 0)
                {
                    if (c2 % j == 0)
                        flag = 1;
                }
                else
                    break;
            }
        }
        static  void Main(string[] args)
        {
            c = 23;
            m = (Int32)Math.Sqrt((double)c);
            c2 = (int)c;
            ThreadStart thread1 = new ThreadStart(WithDraw1);
            Thread newThread1 = new Thread(thread1);
            ThreadStart thread2 = new ThreadStart(WithDraw2);
            Thread newThread2 = new Thread(thread2);
            newThread1.Start();
            newThread2.Start();
            if (flag == 0)
                Console.WriteLine("是素数");
            else
                Console.WriteLine("不是素数");
        }
    }
}