Integers and Floats

• Look at the picture on page 90.
  • Char as an integer type should be surprising?
  • Where is string on this list?
• Integers
  • An integer between INT_MIN and INT_MAX.
  • Look at /usr/include/limits.h
  • There are actually four integer types + 1.
    • char
    • short
    • int
    • long
  • There is no given size, just a relationship among the types.
  • There is also unsigned.
  • Char is strange in that I/O uses the ASCII table.
  • Others this is not the case.
  • I/O
    • Output as normal
    • Input:
      • read optional +/-
      • read digits until a non digit is found
      • If no digits are found go into an error state.
      • And the value of the variable is not changed.
  • Basic Operations:
    • +,-
    • *
    • /
    • %
    • ++, --
      • prefix operators
      • postfix operators
  • Errors: Overflow
• Floats are used to represent real numbers.
  • float, double, long double
  • Floats are numbers in scientific notation.
  • IEEE 754 standard
  • Same operations, but not %
  • Gap and precision.