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C Language INTERVIEW QUESTION & ANSWERS

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26. How can variables be characterized?
  The variables can be categorized by storage class as well as by data type. The storage class specifies the portion of the program within which the variables are recognized.
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27. Give the rules for variable declaration?
 
    The rules for variable declaration in C are given below :
  • A variable name consists of alphabets, digits and the underscore (_) character
  • The length of variable should be kept upto 8 characters though your system may allow upto 40 characters
  • They must begin with an alphabet
  • Some systems also recognize an underscore as the first character
  • White space and commas are not allowed
  • Any reserved word (keyword) cannot be used as a variable name.
  Posted by mathankumar. (Nov 21, 2013)
 

The length of variable should be kept upto 8 characters in ansi c. But other c softwares have allow upto 31 characters

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28. What is the purpose of type declarations?
  The type declaration allow to create a synonym for other data types. Its syntax is typedef type identifier; The declaration typedef unsigned long int INTEGER
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29. What is recursion?
  C language a function may call another function. When a function calls itself, it is referred to as recursive call and the process is known as recursion. C provides very good facilities for recursion.
  Posted by Dastagirsab Bagwwan. (Oct 11, 2013)
 

Recursion is a technique which calls and recalls of interm of itself is called recursion.

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30. What is data types?
  Data types refer to the classes of data that can be manipulated by C programs. The three fundamental data types supported by C are character, integer and real type.
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