Question 4: Test of the class Journal

Who purchased Harry Potter III?
Client: Grace Hopper, date: 1
Client: Larry O'Brien, date: 3

Who purchased HALO 2?
Client: Larry O'Brien, date: 1
Client: Grace Hopper, date: 1

Purchases for Larry O'Brien: { 47 18 }
Purchases for Grace Hopper: { 70 }
Total purchases: 135

The journal is full. Unable to add a new purchase.