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IMP Core Environment Standard
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Section 11: Miscellaneous
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$b4$v5$t0 * $t %constant %name NIL$b0
$p The predefined pointer NIL may be used to terminate linked lists of items;
any pointer variable which is pointing to NIL will have all its bits clear
(0) {IAY: better wording required here, but see language implications section}.




$b4$v5$t0 * $t %integer %function SIZE OF ( %name X )
$p The number of storage units occupied by the given variable is returned.
The unit is machine dependent but is commonly a byte.




$b4$v5$t0 * $t %integer %function TYPE OF ( %name X )
$p This function returns a code which indicates the type of the object
supplied as parameter. The complete list of code values which may be returned
by TYPE$ OF is as follows:
$b$v5$l0
         0 - unknown type
         1 - %integer
         2 - %real
         3 - %string
         4 - %record
         5 - %byte %integer
         6 - %short %integer
         7 - %long %integer
         8 - %long %real
         9 - %array
        10 - %label
$b0