Answer: Feedback
Explanation: Feedback is the reaction obtained in the form of information from the task a person has performed or any product. It gives the review of the service that is given by the customer, user etc.The reaction that is obtained can be a negative feedback or positive feedback.
Both types of feedback is necessary because it helps in the improvement of the service. The negative reaction will helps to change/improve the service that is not liked by the customer and positive feedback tells about the services appreciated by the customer. So, Shelby is also keeping the feedbacks for the same purpose for her salon business.
 
        
             
        
        
        
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Answer:
<u>How to implement a stack in C using an array?</u>
A stack is a linear data structure that follows the Last in, First out principle (i.e. the last added elements are removed first).
This abstract data type can be implemented in C in multiple ways. One such way is by using an array.
Pro of using an array:
No extra memory required to store the pointers.
Con of using an array:
The size of the stack is pre-set so it cannot increase or decrease.