#include <iostream.h>
          main()
         {
               int totalCalls,callcounter,Duration;
               int longest, shortest;
               double average ;

         while(callcounter <= 10) //using ten as the  amount o call to easy use 
               {
                  cout << "Enter Call duration  :\n"; \\ lenght of calls 
                  cin   >> Duration ;\\ user input 
               
               totalcalls = totalcalls + duration;\\ adds duration to call total
               callcounter+ ; \\add one or every loop to counter 
          
               }//end while 

                 average = totalcalls/callcounter;\\ average of all calls 
                 if (duration ==5)
                    shortest = duration

               
              cout << " Average length of all calls :"<< average <<"\n";
              cout << " Total length of all calls  :"<< totalcalls<<"\n";
              cout << " Total of call\t :"<< callcounter<<"\n";
        }endmain


 

#define max(a,b) a>b?a:b
#define min(a,b) a<b?a:b
int max,int min;
...
max=max(x[0],x[1]);
min=min(x[0],x[1]);
for (i=2;i<n;i++)
   {
     max=max(max,x[i]);
     min=min(min,x[i]);
   }
...