C++ code for state machine

Question

This was an interview question to be coded in C++:

Write code for a vending machine: Start with a simple one where it just vends one type of item. So

Answer 1

I've written plenty of state machines using these methods. But when I wrote Cisco's Transceiver Library for the Nexus 7000 (a $117,000 switch) I used a method I invented in the 80's. That was to use a macro which makes the state machine look more like multi-tasking blocking code. The macros are written for C but I have used them with small modifications for C++ when I worked for DELL. You can read more about it here: https://www.codeproject.com/Articles/37037/Macros-to-simulate-multi-tasking-blocking-code-at