#include <iostream>
#include <pthread.h>
#include <stdlib.h>

using namespace std;

int main(int argc, char *argv[])
{
   pthread_t ThreadA,ThreadB;
   int N;

   if(argc != 2){
      cout << "error" << endl;
      exit (1);
   }

   N = atoi(argv[1]);
   pthread_create(&ThreadA,NULL,task1,&N);
   pthread_create(&ThreadB,NULL,task2,&N);
   cout << "waiting for threads to join" << endl;
   pthread_join(ThreadA,NULL);
   pthread_join(ThreadB,NULL);
   return(0);
}

void *task1(void *X)
{
   int *Temp;
   Temp = static_cast<int *>(X);

   for(int Count = 1;Count < *Temp;Count++){
       cout << "work from thread A: " << Count << " * 2 = "
            << Count * 2 << endl;
   }
   cout << "Thread A complete" << endl;
}

void *task2(void *X)
{
   int *Temp;
   Temp = static_cast<int *>(X);

   for(int Count = 1;Count < *Temp;Count++){
       cout << "work from thread B: " << Count << " + 2 = "
            << Count + 2 << endl;
   }
   cout << "Thread B complete" << endl;

}