Wednesday, 23 September 2015

C Programming Interview Questions and Answers

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
=> Identifiers
=> Keywords
=> Operators
=> Special symbols
=> Strings

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 acccessed by all the functions defined after their declaration. So, the variables declared before the main {) can be acccessed by all the functions, which follow their declaration.

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