c

• C is a programming language developed by "DENNIS RITCHE" in the year 1972.
• VARIABLE: Variable is the name of a memory location which stores some data.

  RULES FOR CONSTRUCTING A VARIABLE:

  • Variables are case sensitive[a and A are two different words]
  • 1st character is an alphabet or "_"
  • No comma/blank space should be included.
  • No other symbol other than "_" can be used..
• "int" stores integer value
• "float" stores all the decimal values
• "char" stores all the characters
• Data types and their corresponding sizes in bytes:

  • char (or) signed char: 1 byte
  • unsigned char: 1 byte
  • int (or) signed int: 4 bytes
  • unsigned int: 2/4 bytes
  • short int (or) unsigned short int: 2 bytes
  • signed short int: 2 bytes
  • long int (or) signed long int: 4 bytes
  • unsigned long int: 4 bytes
  • float: 4 bytes
  • double: 8 bytes
  • long double: 16 bytes