how to implement Online transaction example using stack and queue in C++

hello guys,

online transaction can be done by customer and he must enter all correct details otherwise the entre stack is to be thrown out. i have to use queue to queue the customers and to use stack for each transaction operation(username,password,amount,etc).

I have to implement the above using STACKS AND QUEUES in C++.. its college assignment, pls help me out..

give me the idea how to start the work on this.
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