C++ Counter Class Implementation

Questions and Answers

What is the purpose of the private member variable 'counter' in the Counter class?

To define the default increment value for the counter.

To store a reference to another instance of the Counter class.

To keep track of the current counter value. (correct)

To limit the number of times the call method can be invoked.

What will be the output of the program if the initial value provided to the Counter object is 10?

11, 12, 13

10, 11, 12 (correct)

10, 10, 10

10, 11, 11

What is the expected output after executing the for loop in the main function?

The program will print 'call' three times.

The program will store the number of calls made in 'output'. (correct)

The program will not compile due to an error in the vector declaration.

The program will give a runtime error when accessing the call method.

What would happen if the call method were called without an initial value for the Counter object?

It would result in a compilation error due to missing parameters. Signup and view all the answers

How does the method 'call' modify the state of the Counter object?

It increments the counter value by 1 after returning the current value. Signup and view all the answers

In the provided code, what is the return type of the 'call' method?

int Signup and view all the answers

Study Notes

Counter Class Implementation

Purpose: The Counter class is designed to maintain and manage a simple integer counter.
Private Member Variable: Contains an integer counter which tracks the current counter value.
Constructor: Initializes the counter with a specified initial value provided by the user during object creation.

Public Methods

call() Method: Increments the counter and returns its current value before the increment occurs.

Main Function Workflow

Initial Value: Preset initial value for the counter is set to 10.
Method Calls: An array of string commands, containing multiple "call" commands, is prepared to trigger the counter.
Output Storage: A vector is utilized to store output values returned from each method call.

Example Execution

Counter Object Creation: An instance of the Counter class is created with the initial value of 10.
Loop Through Calls: The program iterates through the call commands; for each "call", it invokes the call() method and adds the result to the output vector.
Result Display: Finally, the results stored in the output vector are printed to the console.

Important Details

Increment Behavior: The counter starts at the initial value and increases by one for each call.
Vector Usage: The output collection leverages the vector class from the standard library for dynamic array management.

Description

This quiz tests your understanding of creating a class in C++. You will learn how to implement a Counter class with methods to manage its value and understand object-oriented principles in C++. Dive into the basics and see how you can manipulate class objects with simple methods.