Use the data flow diagram flow diagram to describe the coffee machine in Example 5.4

Consider a common coffee vending machine that can dispense regular and decaffeinated coffee with or without sugar and milk. We can describe the system using a structure chart as in Figure 5.2. After accepting the customer's coins and remitting any change owed, the machine reads the buttons pressed. Then regular coffee, decaffeinated coffee, or tea is dispensed, depending on the choice. Next, milk and/or sugar is dispensed