What does the following program do?
```
// What does this program do?
#include
using namespace std;
int whatIsThis( int [], int ); // function prototype
int main()
{
const int arraySize = 10;
int a[ arraySize ] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
int result = whatIsThis( a, arraySize );
cout << "Result is " << result << endl;
} // end main
// What does this function do?
int whatIsThis( int b[], int size )
{
if ( size == 1 ) // base case
return b[ 0 ];
else // recursive step
return b[ size - 1 ] + whatIsThis( b, size - 1 );
} // end function whatIsThis
```
This program sums array elements. The output would be
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