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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.
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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
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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.
  Posted by Anil. (Mar 04, 2014)

Variable is a memory location, we can change its value at run time.

  Posted by Pavani. (Oct 03, 2013)

Varaible is a Datatype, used to store the data values.

  Posted by Ghanshyam. (May 02, 2013)

Variable is a memory area/block where the value can be stored.

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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.
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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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