You can declare a variable using a define form.
This takes a variable name, and an expression. It declares a new
variable with the given name, and assigned the value of the
expression to the variable.
#|kawa:1|# (define binary-kilo 1024) #|kawa:2|# (define binary-mega (* binary-kilo binary-kilo)) #|kawa:3|# binary-mega 1048576
A define typed into the command-line
defines a top-level variable.
You can also declare local variables. TODO.