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Strings V. operators 15. What do you mean by reference variable in c++? Ans: A reference variable provides an alias to a previously defined variable. Data type & reference-name = variable name 16. What do you mean by implicit conversion? Ans: Whenever data types are mixed in an expression then c++ performs the conversion automatically. Here smaller type is converted to wider type. Example- in case of integer and float integer is converted into float type. 17. What is the difference between method overloading and method overriding? Ans: Overloading a method (or function) in C++ is the ability for functions of the same name to be defined as long as these methods have different signatures (different set of parameters). Method overriding is the ability of the inherited class rewriting the virtual method of the base class. 18. What are the defining traits of an object-oriented language? The defining traits of an object-oriented language are: encapsulation inheritance polymorphism Ans: Polymorphism: is a feature of OOPL that at run time depending upon the type of object the appropriate method is called.

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If you would like to view All C++ language interview questions only, at one place, visit below link All C++ Language Interview Questions 11. What is abstraction? Ans: The technique of creating user-defined data types, having the properties of built-in data types and a set of permitted operators that are well suited to the application to be programmed is known as data abstraction. Class is a construct for abstract data types (ADT). 12. What is encapsulation? Ans: It is the mechanism that wraps the data and function it manipulates into single unit and keeps it safe from external interference. 13. How variable declaration in c++ differs that in c? Ans: C requires all the variables to be declared at the beginning of a scope but in c++ we can declare variables anywhere in the scope. This makes the programmer easier to understand because the variables are declared in the context of their use. 14. What are the c++ tokens? Ans: c++ has the following tokens I. keywords II. Identifiers III. Constants IV.

40. What is dynamic memory allocation? Ans: A dynamic memory allocation uses functions such as malloc() or calloc() to get memory dynamically. If these functions are used to get memory dynamically and the values returned by these function are assigned to pointer variables, such a way of allocating memory at run time is known as dynamic memory allocation. Related Fresher Interview Questions 1. C Language Interview Questions 2. C++ Language Interview Questions 3. Data Structures Interview Questions 4. DBMS Interview Questions 5. Operating System Interview Questions 6.

Multi-programmed operating systems 3. timesharing operating systems 4. Distributed operating systems 5. Real-time operating systems is a boot-strap program? is BIOS? 8. Explain the concept of the batched operating systems? Ans: In batched operating system the users gives their jobs to the operator who sorts the programs according to their requirements and executes them. This is time consuming but makes the CPU busy all the time. 9. Explain the concept of the multi-programmed operating systems? Ans: A multi-programmed operating systems can execute a number of programs concurrently. The operating system fetches a group of programs from the job-pool in the secondary storage which contains all the programs to be executed, and places them in the main memory. This process is called job scheduling. Then it chooses a program from the ready queue and gives them to CPU to execute. When a executing program needs some I/O operation then the operating system fetches another program and hands it to the CPU for execution, thus keeping the CPU busy all the time.

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35. What does the error 'Null Pointer Assignment' means and what causes this error? Ans: As null pointer points to nothing so accessing a uninitialized pointer or invalid location may cause an error. 36. What is generic pointer in C? Ans: In C void* acts as a generic pointer. When other pointer types are assigned to generic pointer, conversions are applied automatically (implicit conversion). 37. Are the expressions arr and &arr same for an array of integers? Ans: Yes for array of integers they are same. 38. IMP>How pointer variables are initialized? Ans: Pointer variables are initialized by one of the following ways. I. Static memory allocation II. Dynamic memory allocation 39. What is static memory allocation? Ans: Compiler allocates memory space for a declared variable. By using the address of operator, the reserved address is obtained and this address is assigned to a pointer variable. This way of assigning pointer value to a pointer variable at compilation time is known as static memory allocation.

10. Explain the concept of the timesharing operating systems? Ans: It is a logical extension of the multi-programmed OS where user can interact with the program. The CPU executes multiple jobs by switching among them, but the switches occur so frequently that the user feels as if the operating system is running only his program. Related Fresher Interview Questions 1. C Language Interview Questions 2. C++ Language Interview Questions 3. Data Structures Interview Questions 4. DBMS Interview Questions 5. Operating System Interview Questions 6. UNIX Interview Questions Tags: interview questions and answers, interview questions for operating system, Operating System, operating system interview, operating system interview questions, operating system interview questions 2009, operating system interview questions and answers for freshers, operating system interview questions and answers pdf, operating system interview questions answers, operating system questions, operating system tutorial

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Inheritance: is a feature of OOPL that represents the "is a" relationship between different objects (classes). Say in real life a manager is a employee. So in OOPL manger class is inherited from the employee class. Encapsulation: is a feature of OOPL that is used to hide the information. 19. What is polymorphism? Ans: Polymorphism is the idea that a base class can be inherited by several classes. A base class pointer can point to its child class and a base class array can store different child class objects. 20. What do you mean by inline function? Ans: An inline function is a function that is expanded inline when the compiler replaces the function call with the corresponding function code. An inline function is a function that is expanded in line when it is invoked. That is the compiler replaces the function call with the corresponding function code (similar to macro). Related Fresher Interview Questions 1. C Language Interview Questions 2. C++ Language Interview Questions 3. Data Structures Interview Questions 4.

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