/* */
#include <iostream>  
#include <cstdlib>
using namespace std;
int main(int argc, char *argv[])
{  int N=0, num, n=0, sum=0, x=0,y=0;
   double average;
   cout<<"give a num= ?"; 
   cin>>num;
   while (num != 0) {
     N++;
     if (num <= 20 && num >=-20) 
     {n++; sum+=num; }
     x=y;y=num;
     if ((x+y)>15 && (N>1)) 
        {cout<<x<<" "<<y<<endl;}
     cout<<"give a num= ?"; 
     cin>>num;
   }
   if (N>0)
     if (n>0) {
       average=(double) sum/n;
       cout<<"There are "<<n<<" in [-20,20] and AVERAGE is "<<average<<endl;}
     else cout<<"NO numbers in [-20,20] given"<<endl; 
   else cout<<"NO input data numbers given"<<endl;
   system("PAUSE");
   return 0;
}