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#include <iostream>
using namespace std;
 
int main() {
	// your code goes here	int n,sum=0;
	cout<<how many numbers ?;
	cin>>n;
	int arr[n];
	cout<<enter <<n<< numbers;
	for(i=0;i<n;i++)
	{
		cin>>arr[i];
		sum+=arr[i];
	 } 
	 cout<<sum is <<sum;
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:6:8: error: ‘how’ was not declared in this scope
  cout<<how many numbers ?;
        ^~~
prog.cpp:7:7: error: ‘n’ was not declared in this scope
  cin>>n;
       ^
prog.cpp:9:8: error: ‘enter’ was not declared in this scope
  cout<<enter <<n<< numbers;
        ^~~~~
prog.cpp:9:20: error: ‘numbers’ was not declared in this scope
  cout<<enter <<n<< numbers;
                    ^~~~~~~
prog.cpp:10:6: error: ‘i’ was not declared in this scope
  for(i=0;i<n;i++)
      ^
prog.cpp:12:8: error: ‘arr’ was not declared in this scope
   cin>>arr[i];
        ^~~
prog.cpp:13:3: error: ‘sum’ was not declared in this scope
   sum+=arr[i];
   ^~~
prog.cpp:15:9: error: ‘sum’ was not declared in this scope
   cout<<sum is <<sum;
         ^~~

Standard output is empty