C++ can be described as a better version of the C programming language. The cross-platform language with a general purpose can help programmers gain increased control over system memory and resources. Knowing how to answer the most common C++ interview questions is the best way to show employers that you are the right fit for the job. Dive deeper to learn about the most common CPP interview questions and how to answer them.
C++ interview can be very difficult to get into, so it’s important to know what you’re getting into. We bring to you the top C++ Interview Questions asked with sample answers that would help demonstrate your knowledge of the industry and the job role.
Some of the most basic C++ interview questions are as follows:
It is one of the C++ interview questions that you must be able to answer to impress the interviewer. A few key differences between the two programming languages are as follows:
C | C++ |
---|---|
Procedure-oriented | Object-oriented |
Does not facilitate data hiding | Enables data hiding |
Subset of C++ | Superset of C |
Lacks function and operator overloading | Allows function and operator overloading |
Functions are not definable within structures. | Functions are definable within structures. |
It is one of the C++ interview questions and answers that interviewers expect all candidates to know. A few key features of the C++ programming language are as follows:
Polymorphism in C++ makes a particular object or function act differently in multiple scenarios. In simple terms, it revolves around conveying the same message in different ways. For instance, the “+” operator is useful for performing different functions in different scenarios.
Let’s move to the next c++ interview question.Access specifiers in the C++ programming language are leveraged to define the way of accessing different attributes and methods of a class. You will find three types of access specifiers in C++:
It is one of the most frequently asked C++ interview questions to freshers. A class is a user-defined data structure with a keyword class containing functions and data similar to its members. Objects are data structures that can be defined as class instances.
Let’s move to the next c++ interview questions.It is one of the trickiest CPP interview questions. A structure in C++ is quite similar to a class except for a handful of differences. A few differences between struct and class are as follows:
Struct | Class |
---|---|
Struct members are public by default. | Class members are private by default. |
While deriving a struct from a struct or class, the default access specifiers will be public. | While serving a class, the default access specifiers remain private. |
Read: Advantages and Disadvantages of Arrays in C, C++, and Java
Let’s move to the c++ interview questions for intermediate.
A few CPP interview questions for the intermediate level are as follows:
You should be using the class template for creating a class parameterized by any particular type. A function template is for creating a function operating on different types.
Function templates are capable of performing type deduction. They can be employed to develop factory functions:
Class templates are utilized to code programs executed at the time of compilation. Class templates are executed using types like values and template instantiations with patterns aligning as pure functions. One example of this is the class template set removing const from a type:
Let’s move to the next c++ interview questions.
It is one of the most important C interview questions. Operator overloading can be defined as a polymorphism for compilation time. This technique can help assign a special meaning to any existing operator without modifying its real meaning.
In the C++ programming language, operators are used for user-defined classes. Therefore, C++ can assign a special meaning to operators for a specific data type. This ability can be titled operator overloading.
For instance, you can overload an operator “+” in a String class. It will ensure that you can concatenate more than one string with the help of the + operator. Some other classes where arithmetic operators might be overloaded include complex numbers, big integers, and fractional numbers.
It is one of the C++ interview questions and answers to demonstrate your awareness regarding different functions. The difference between virtual functions and pure virtual functions are as follows:
Virtual Function | Pure Virtual Function |
---|---|
Belongs to a base class which can be redefined by derived class | Belong to a base class whose declaration is available in the base class and needs to be defined within a derived class to prevent it from becoming an abstract |
Not abstract classes | Becomes abstract |
Syntax: virtual<func_type><func_name>() |
Syntax: |
Definition is available in base class | No definition is available in base class |
Can be instantiated | Cannot be instantiated |
Does not affect compilation | Prevents compilation error but the derived class becomes abstract |
May or may not redefine virtual function of the base class | Derived classes can redefine pure virtual functions of the base class otherwise the derived class becomes abstract |
C++11 makes the auto keyword a new type specifier. It serves as a placeholder to deduce a type from the initial variable expression. As auto type deduction gets enabled, you won’t be required to mention a type during variable declaration. Instead, the compiler will deduce the type of an auto variable from its initializer expression. One example of the auto-type deduction is as follows:
The function objects in C++ are useful for implementing operators (). Function objects are primarily used in the C++ standard library as container sorting criteria in algorithms.
Let’s move to the next c++ interview questions.The keyword mutable is utilized for modifying a specific data member of a const object. After declaring a function as const, the pointer passed to the function turns into const. When a mutable gets added to a variable, it can enable a const pointer to modify members.
Understand: Fibonacci series in C
Let’s move to the c++ interview questions for experienced.
A few C++ interview questions and answers for experienced professionals are as follows:
Malloc() and new are useful for allocating dynamic memory in a heap. The malloc() operator is a valuable C library function, also applicable in C++. You should prefer new when you are required to call the constructor class.
Let’s move to the next c++ interview question.You will be able to compile a program without the main() function by using macros. The code for it is as follows:
The parameterized constructor can accept arguments or parameters. It can be called explicitly by passing values in the arguments. These arguments enable object initialization during its creation. The parameterized constructor will feature the same name as that of the class and can be used to overload constructors. An example of the parameterized constructor is as follows:
A virtual destructor in C++ is applied in the base class to prevent the derived class object from getting destroyed. An example of this is as follows:
Find out: What is Arrays in C, C++
In this guide we have discussed some of the most important and common C++ interview questions with answers. Once you are prepared with these C++ interview questions, you have a greater chance of getting the selected in the interview and crack the offer. When you are able to answer these questions, the interviewer will develop a certain level of trust in your skills. Therefore, keep expanding your C++ knowledge to impress employers and quality for high-paying jobs.
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