#include <iostream>
using namespace std;
 
int sum(int[],int);//
int main()
{
 int  a[]={11,33,55,77};//
 int size=sizeof (a)/sizeof(int);//
 
 cout << "sum(a,size)="<<sum(a,size)<<endl;
}
int sum(int a[],int n)//
{ 
 
   int sum=0;
   for (int i=0;i<n;i++)
   sum+=a[i];
   int Avg= sum/4;
   cout<<"Avg="<<Avg<<endl;
 return sum;
}

#include <iostream>
using namespace std;

int sum(int[],int);// (1) function declaration or prototype
int main()
{
   int  a[]={11,33,55,77};// (2) initialization of an array
   int size=sizeof (a)/sizeof(int);// (3) initialize size with number of elements in a

   cout << "sum(a,size)="<<sum(a,size)<<endl;
}
int sum(int a[],int n)// (4) function definition
{

   int sum=0;
   for ( int i=0;i<n;i++ )
      sum+=a[i];
   int Avg= sum/4;
   cout<<"Avg="<<Avg<<endl;
   return sum;
}