double Average( const apvector2.& A ) { double Sum = 0.0; for( int i = 0; i < A.length( ); i++ ) Sum += A[ i ]; return Sum / A.length( ); // Precondition is A.length( ) > 0 }
int main( ) { ifstream fin; int NumberOfItems; apvectorA; int i; fin.open( "input.txt" ); fin >> NumberOfItems; A.resize( NumberOfItems ); for( i = 0; i < NumberOfItems; i++ ) fin >> A[ i ]; cout << "Average is " << Average( A ) << endl; return 0; }