C++ Interview Questions and Answers:


In order to land a job in C++, you will need to pass an interview. The best way to prepare for an interview is to study common C++ interview questions and answers. In this blog post, we will provide you with the top ten C++ interview questions and answers.

1. What are some important features of the C++ language? 

C++ has a wide variety of important features that make it a powerful language. Some of the key features include:

1) It is an object-oriented language, which makes it easy to create complex applications.
2) It is well-suited for developing advanced software applications.
3) It has a wide variety of built-in functions and operators that can be used to perform various tasks in your code.

2. What advantages does C++ have over other programming languages? 

C++ has a wide variety of advantages over other programming languages, which makes it the best language for software development productivity. 

C++ offers better performance than other languages. This can be seen in scenarios such as compiling time and execution time. In compiled applications, C++ takes less time to produce an executable file than other languages such as Java or Python. However, compilation speed is not the only consideration when choosing a programming language; execution speed matters too.

Besides performance benefits, another advantage that C++ has over other programming languages is its universality. Programming paradigms and interfaces across different platforms are easier to develop using C++ than using multiple individual programming languages for different platforms (for example iOS/Android apps).

3. Why is it important to use Inheritance in designing your classes? 

When you create a class, you are actually creating an object. The code that is in the class represents what the object can do and it’s shared by all of the objects that have this class as their base. This type of inheritance makes it easy to change the behaviour or structure of your classes without affecting any of the other classes that use them.
When you inherit from a base class, all of its members become available to your derived classes. This means you don’t have to duplicate code or remember how each member works; everything is simply there for you when you need it. Inheritance also provides better inheritance for polymorphism because now each derived class has its own specific set of behaviours instead of inheriting from one generic ancestor. 

Inheritance can be useful in many situations, but here are ten examples: 
1) When different parts of your application use similar functionality – having a single place where all pieces fit together reduces maintenance and improves clarity
2) When different parts of your system rely on data created by other parts – centralizing this data helps keep track and prevents errors
3) When multiple teams need access to a common library – using inheritance makes it easier to share resources while still ensuring customization
4) As features are added to an existing product – keeping related code organized into well-defined types lets developers more easily find what they need when working on new features.

4. What are const and volatile variables, and why are they useful? 

A variable is a location in memory where you can store data. When you declare a variable, you tell the computer what type of data it can hold (integer, string, etc.), and how to access that data.

const stands for “constant,” which means the value stored in this variable cannot change. For example, if you have a const int x = 5; declaration in your code, x will always be equal to 5. 

volatile variables are different from const variables because they allow their value to change after they’re initialized (or declared). This enables benefits like efficient cache management and randomized execution across multiple threads without causing problems. However, volatile variables also require special care when their values are changed: changes made to a volatile variable must occur atomically or as part of an atomic operation. 
If an update happens at any other time during that operation, then the previous contents of the volatile variable might still be visible outside of its scope. This could cause unexpected behaviour or errors when used incorrectly..

5. Describe how streams work, and describe an example of their use 

Streams are a powerful mechanism that can be used to process data in an efficient way. They allow you to take large amounts of data and process it quickly, achieving parallelism. An example of their use would be sending stock prices through the mail so that they can reflect the movements instantaneously.

When working with streams, you need to consider how many threads (processes) will be needed to handle the data stream accurately and efficiently.

6. What is a common problem caused by using streams? 

One common problem caused by using streams is when an error occurs while trying to extract information from the stream which then impacts downstream processing tasks; this phenomenon is known as “the curse of knowledge” and can happen when attempting any sort of extraction operation on top of a stream – such as scanning text documents or looking for specific values within tables.

7. How exceptions help manage errors conditionally within your programs   

In order to properly manage errors within your programs, you need to understand how exceptions work. Exceptions are a special type of program control that allows one part of the program to transfer control to another part without stopping the entire application. 

This is important because it allows you to handle any kind of error situation. For example, if you try and access a file that doesn’t exist, an exception will be thrown and the rest of your code can deal with it accordingly. This is also beneficial in situations where you want some parts of your code to continue running even if something goes wrong elsewhere in the application. 

8. What’s the difference between pointers and references, and why should you use one over the other? 

There are two main types of data in programs: values and references. Values can be initialized and deinitialized, but references cannot. References also take longer to access than pointers because they need to search the memory for the referenced object. 

Pointers are faster when accessing data by value because a pointer just points to the location in memory where you want to start reading or writing from (there’s no copying involved). This makes it great for code that needs to quickly access large blocks of data, like arrays or strings. Additionally, using pointers is usually less error-prone than using references since a mistake with a pointer will not cause your program to crash, while referencing an invalid object will result in an error message. 

There’s one downside though – whenever you delete something inside an array allocated via one of these methods, all stored indices associated with those objects get clobbered


In this blog, we discussed the top ten C++ interview questions and answers. We talked about some of the important features of the C++ language, its advantages over other languages, and how to make decisions when writing code. We also discussed inheritance, const and volatile variables, streams, exceptions, pointers and references.


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