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Data type

The goal of any programmer is to unlock the secrets of the bit.

Bit
  • A single bit in a data type, like a integer.
  • In C++ they are accessed with bitwise operations.
  • A bitmask is a integer that select a number of bits. Ex 0x4 select the third bit.
  • Bit Fields - 2013
Boolean
  • A true or false value.
  • In C++ it's stored in a int and 0 is false and everything else is true.
Integers
  • Integer is a data type that represents a subset of whole numbers.
  • Unsigned can only contain non-negative numbers. Signed can have both positive and negative values.
  • Width of an integral type is the number of bits it use.
Real numbers
Text
Characters
  • A single text character in a alphabet but it often also include control characters such as new line.
  • Typically combined into strings.
  • Each character is a number and how many bits are needed for a character depends on the size of the character set.
  • The mapping of character number to a specific symbol is called the character encoding.
Strings