Program in C++ to find the sum of all array elements using function

Program in C++ to find the sum of all array elements using function

#include<iostream>
#include<iomanip>
#include<conio.h>
#define size 30
 using namespace std;
 int Arraysum(int *arr,int);
 int main()
  {
   int a[size],n;
   cout<<" Enter the size of array:-";
   cin>>n;
   if(n>size)
     {
      cout<<" Invalid array size.";
      return 0;
  }
 else
   {
      cout<<" Enter "<<n<<" elements :-";
      for(int i=0;i<n;i++)
      cin>>a[i];
     int sum=0;
     sum=Arraysum(a,n);
     cout<<" sum of all elements = "<<sum;
       }
     }
   int Arraysum(int *arr,int n1)
     {
      int sum=0;
      for(int i=0;i<n1;i++)
       {
    sum+=arr[i];   //*(i+arr); //*(arr+i); //i[arr];
    }
    return sum;
  }

Output:-