even odd number

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#include<iostream>
using namespace std;

void main()
{ int n=0;
   bool flag=false;
  cout<<"enter the integer number"<<endl;
  cin>>n;
  if (n>0)
  {
  if(n%2==0)
 {flag=true;
 cout<<"the number is even"<<endl;
  }
  else
   cout<<"number is odd";
  }
 else if (n<0)

cout<<"invalid number";
}