Numbers

Integers

Decimal       123 
Octal         0123 
Hexadecimal   0x123
Binary        0b1010

• The standard class for integers is Fixnum
• If a value is too large for Fixnum, it's stored as Bignum, which can hold a value of any size
• Underscore characters are ignored in a digit string
  

Floating-point numbers

• aka "Floats"
• Stored using the Float class
  
• The decimal point must be followed by a digit

12.3
-.12e3
12e-3