Numbers
• integers: 12, 43
• longs: 112346780L, 1L
• unsigned integers: 32u, 55U
• unsigned longs: 862ul, 10UL
• doubles: 25.8, 1e-3
• long doubles: 58.23L
• floats: 98.2f
• hexadecimal: 0x7, 0x1f
• octal: 06, 032

Characters
• single character in single quotes: 'a', '2'
• escape sequence
  • \a alert
  • \b backspace
  • \f formfeed
  • \n newline
  • \r carriage return
  • \v vertical tab
  • \t horizontal tab
  • \\ backslash
  • \? question mark
  • \' single quote
  • \" double quote
• arbitrary byte-sized pattern
  • 3 octal digits (highest digit < 4): \0354
  • 2 hexadecimal digits: \0x5f

Strings
• zero or more characters in double quotes: "Hello, World!\n", ""