$3-$ Use a data flow diagram to describe the coffee machineconsider 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 $5\mathrm{.}2.$ 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.