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1.1.2 Scheme variables
Scheme variables can have any valid Scheme value, including a Scheme procedure.
Scheme variables are created with define:
guile> (define a 2) guile>
Scheme variables can be evaluated at the guile prompt simply by typing the variable name:
guile> a 2 guile>
Scheme variables can be printed on the display by using the display function:
guile> (display a) 2guile>
Note that both the value 2 and the guile prompt guile
showed up on the same line. This can be avoided by calling the
newline procedure or displaying a newline character.
guile> (display a)(newline) 2 guile> (display a)(display "\n") 2 guile>
Once a variable has been created, its value can be changed with set!:
guile> (set! a 12345) guile> a 12345 guile>