2-5.cpp

为初学者提供的最佳的C++程序设计源程序库

#include<iostream.h>
#include<process.h>
void main()
 {
   long x;
   cout<<"Please enter a number: \n";
   cin>>x;
   for(long n=2;n<x/2;n++)
   if(x%n==0)
   { 
      cout<<"It's not prime,can be divied by"
	  <<n<<endl;
      exit(0);
   }
  cout<<x<<"is a prime!"<<endl;
}