Thursday, 6 February 2014

C Interview Questions and Answers - 1

See the Complete C tutorial Here

1) Who invented C Language?

Dennis Ritchie in 1972 developed a new language by inheriting the features of both BCPL and B and adding additional features. He named the language as just C

2) Who invented B Language?
Ken Thomson at AT&T Bell Labs developed a language and named it B. Even the B language was found to have some short comings to support development of both business applications and system software.

3) Who invented BCPL Language?
Basic Combined Programming Language(BCPL) was developed by Martin Richards, Cambridge university.

4) Why C Language?
C is one of the high level languages. It is a general purpose language, which means it can be used to write programs of any sort.

5) What are the features of C Languages?

In C one can write programs like that of high level languages as in COBOL, BASIC, FORTRAN etc. as well as it permits very close interaction with the inner workings of the computer.
It is a general purpose programming language. It is usually called system programming language but equally suited to writing a variety of applications.
It supports various data types
It follows the programming style based on fundamental control flow constructions for structured programming
Functions may be pre–defined or user defined and they may return values of basic types, structures, unions or pointers.

6)What are the advantages of c language?
Easy to write
Rich set of operators and functions that are built–in
Support for bit–wise operation
Flexible use of pointers
Direct control over the hardware
Ability to access BIOS/DOS routines
Interacting using Interrupts
Ability to write TSR programs
Ability to create .COM files
Ability to create library files (.LIB)
Ability to write interface programs
Incorporating assembly language in C program

7) What are the disadvantages of c langauge?C is considered difficult to learn
Because of its conciseness, the code can be difficult to follow
It is not suited to applications that require a lot of report formatting and data file manipulation

8) What are the salient features of c languages?The following are the salient features of C language are :
C is called a middle level language
C supports structured design approach
C is extensible
C is rich in data types and operators
C is portable

9) What is a header file?
Header files provide the definitions and declarations for the library functions. Thus, each header file contains the library functions along with the necessary definitions and declarations. For example, stdio.h, math.h, stdlib.h, string.h etc.

10) What is character set?
Character set is the set of characters allowed and supported in the programming language. Generally a program is a collection of instructions, which contain groups of characters. Only a limited set of characters is allowed to write instructions in the program.

11) What is C token?
The smallest individual units of a C program are known as tokens.

12) List the different types of C tokens?Constants
Special symbols

13) What is a string?
A string is a sequence of characters ending with NUL. It can be treated as a one–dimensional array of characters terminated by a NUL character.

14) What are qualifiers?
Qualifiers or modifiers are identifiers that may precede the scalar data types (except float) to specify the number of bits used for representing the respective type of data in memory. The qualifiers in C are short, long, signed, and unsigned.

15) What is a function?
A function is a set of statements to perform a specific task.

16) What is a constant?
A constant is a value that does not change during the program execution. A constant used in C does not occupy memory.

17) What are the different types of constants?There are five types of constants. They are :
Integer constants
Floating point constants
Character constants
String literals
Enumeration constants

18) What is variable?
An identifier is used to identify and store some value. If the value of the identifier is changed during the execution of the program, then the identifier is known as variable.

19) What are the rules for the identifier?The first character must be an alphabet or underscore (_)
Digits may be included in the variable
The maximum number of characters in a word are 32 (It may vary depending upon the platform)
No other special characters are allowed.

20) What are global variables?
Global Variables are those, which are required to be accessed by all the functions defined after their declaration. So, the variables declared before the main {) can be accessed by all the functions, which follow their declaration.

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See the Complete C tutorial Here

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