Creating an Integer

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0       # creates the Fixnum 0
123     # creates the Fixnum 123
1_000   # creates the Fixnum 1000. You can use _ as separator for readability

By default the notation is base 10. However, there are some other built-in notations for different bases:

0xFF    # Hexadecimal representation of 255, starts with a 0x
0b100   # Binary representation of 4, starts with a 0b
0555    # Octal representation of 365, starts with a 0 and digits

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