Programming In C Interview Questions And Answers Pdf
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- C programming Interview questions and answers
- Top C Programming Interview Questions you Need to Master in 2021
- C Programming Interview Questions
C questions and answers. C questions and answers with explanation. Switch case. File handling.
C programming Interview questions and answers
What are the fundamental principles of OO programming? Answer: As a developer, you might be tempted to answer that it comprises things like Encapsulation, Polymorphism, Abstraction, and Inheritance. Principles are crucial but they are not the most important aspect of what OO actually is. What is really important is to understand in what grounds OO is built upon, or in other words, what are the foundations of OO programming.
The two most fundamental core concepts on which OO has been built upon in C are this pointer and Dynamic Dispatch. Obviously, there are principles like Encapsulation, Polymorphism, Abstraction, and Inheritance, but these are the consequence and not the generating force behind the OO paradigm in C. Explain Partial Class in C? Answer: Partial classes concept added in. Net Framework 2. What is Thread in C? Answer: Thread is an execution path of a program.
Thread is used to define the different or unique flow of control. What does it mean? Answer: Object Pool is nothing but a container of objects that are ready for use.
Whenever there is a request for a new object, the pool manager will take the request and it will be served by allocating an object from the pool. How does it work? Answer: We are going to use a Factory pattern for this purpose. We will have a factory method, which will take care of the creation of objects.
Whenever there is a request for a new object, the factory method will look into the object pool we use Queue object. If there is any object available within the allowed limit, it will return the object value object , otherwise, a new object will be created and give you back.
What is the difference between early binding and late binding in C? Answer: Early binding and late binding are the concepts of polymorphism. There are two types of polymorphism in C. Compile Time Polymorphism: It is also known as early binding.
Run Time Polymorphism: It is also known as late binding or method overriding or dynamic polymorphism. What is ArrayList? Answer: ArrayList is a dynamic array. You can add and remove the elements from an ArrayList at runtime. In the ArrayList, elements are not automatically sorted. What do you mean by the delegate in C? Delegate is used to represent the reference of the methods of some return type and parameters.
What is a constructor? Answer: A constructor is a class member executed when an instance of the class is created. The constructor has the same name as the class, and it can be overloaded via different signatures.
Constructors are used for initialization chores. Why are strings in C immutable? Answer: Immutable means string values cannot be changed once they have been created. Any modification to a string value results in a completely new string instance, thus an inefficient use of memory and extraneous garbage collection.
The mutable System. StringBuilder class should be used when string values will change. What is object pool in. Answer: An object pool is a container of ready to use objects. It reduces the overhead of creating a new object.
Questions on Looping Statements The section contains questions on if, while, do-while, for, switch, continue and goto looping statements? What is Garbage Collection? Answer: Garbage Collection is a process of releasing memory automatically occupied by objects which are no longer accessible.
Describe the basic construction of a C program. A typical C program consists of a namespace declaration, a class, methods, attributes, the main method, statements, expressions, and comments.
Questions and Answers on Object-Oriented Concepts? Answer: The section contains questions and answers on polymorphism, structures, enumeration, inheritance, method overloading and method overriding, abstract class and interfaces implementation. What is the difference between disposing of and finalize methods in C? Answer: The dispose of the method is explicitly called by user to free unmanaged resources such as files, database connections, etc whereas finalizing method is implicitly called by the garbage collector to free unmanaged resources like files, database connections, etc.
The dispose of method belongs to the IDisposable interface whereas finalize method belongs to the Object class. What is a delegate in C? Answer: A delegate in C is an object that holds the reference to a method. What is the difference between dynamic type variables and object type variables in C?
Answer: The difference between dynamic and object type variables has to do with when the type checking takes place during the application lifecycle. Dynamic type variables handle type checking at run time, while object type variables handle type checking during compile time.
Explain nullable types in C? Answer: Nullable types are data types that, in addition to their normal values, also contain a defined data type for null. Nullable types exist to help integrate C , which generally works with value types, and databases, which often use null values. You can declare a nullable type in C using the following syntax:. What is Managed and Unmanaged code?
Net Platform. It is considered as managed because of the. Net framework which internally uses the garbage collector to clear up the unused memory. Unmanaged code is any code that is executed by application runtime of any other framework apart from. The application runtime will take care of memory, security and other performance operations. Answer: The section contains questions and answers on integer, float, decimal and character data types, variable initialization, their scope and lifetime, arithmetic, relational, logical, bitwise and conditional operators.
Questions and Answers on Miscellaneous topics? Answer: The section contains questions and answers on the basics of pointers and their operation, accessor controls, and string formatting. Answer: The section contains questions and answers on collection framework, mathematical classes, rounding functions, iterators, and multithreaded programming. Answer: One solution would be to create a variable for each item in the set but again this leads to a different problem.
How many variables do you need? Answer: So in this situation Arrays provide mechanisms that solve the problem posed by these questions. An array is a collection of related items, either value or reference type. In C arrays are immutable such that the number of dimensions and size of the array are fixed.
An array contains zero or more items called elements. An array is an unordered sequence of elements. All the elements in an array are of the same type unlike fields in a class that can be of different types.
The elements of an array accessed using an integer index that always starts from zero. C supports single-dimensional vectors , multidimensional and jagged arrays. Elements are identified by indexes relative to the beginning of the arrays. An index is also commonly called indices or subscripts and is placed inside the indexing operator . Access to array elements is by their index value that ranges from 0 to length The length cannot be changed once created.
Elements are initialized to default values. Arrays are reference types and are instances of System. Their number of dimensions or ranks can be determined by the Rank property. An array length can be determined by the GetLength method or Length property. What is Parsing? How to Parse a Date Time String? Answer: Parsing is converting a string into another data type. Follow the same method to convert a DateTime string. Parse DateTime. What are the collection types can be used in C?
Explain Attributes in C? Attributes can be used to add metadata like — comments, classes, compiler instruction, etc. IsAlive — contains value True when a thread is Active.
Top C Programming Interview Questions you Need to Master in 2021
A void pointer is a pointer that can be used to point to any data of any arbitrary type. A void pointer can be dereferenced only after explicit casting. For example:. What is the difference between include " The difference lies in where the preprocessor looks for the file to be included. For the include directive with a double quoted filename, the preprocessor limits its search for the file to the same directory where the current source file resides, and then to the standard directories pre-designated by the compiler.
C is a computer programming language that was developed by Dennis Ritchie and released in the year The original purpose of this language was to develop a system programming language that can be used to write an operating system. This general-purpose language is structured and machine-independent, which makes its applications simple and flexible. So, C is one of the basic and essential computing languages that developers need to know. Currently, C programming is used in numerous key applications such as embedded systems, desktop applications, graphic user interface and compilers. This language also finds application in IoT applications.
C Programming Interview Questions
It is referred to as a terminating null character and is used primarily to show the end of a string value. Answer: Break is used to control out of the block of code which is executing, we can use in loop statements or switch statements. Answer: The main function in c is the one which executes which you run the program but it is not the first function to be executed as there is another start function which gets executed to compile the libraries.
There are actually two ways you can do this. Likewise, the statement "x --" means to decrement the value of x by 1. When using Call by Value, you are sending the value of a variable as parameter to a function, whereas Call by Reference sends the address of the variable.
Dear readers, these C Programming Interview Questions have been designed specially to get you acquainted with the nature of questions you may encounter during your interview for the subject of C Programming. It de-refers twice to point to the data held by the designated pointer variable. By default every local variable of the function is automatic auto. Break can appear only with in the looping control and switch statement. The purpose of the break is to bring the control out from the said blocks.
C is a mid-level and procedural programming language. The Procedural programming language is also known as the structured programming language is a technique in which large programs are broken down into smaller modules, and each module uses structured code. This technique minimizes error and misinterpretation.
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