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D.12.2.42 find_index

Procedure from library crypto.lib (see crypto_lib).

Usage:
find_index(a, e)

Return:
Returns the list index of element e in list a. Returns 0 if e is not in a

Example:
 
LIB "crypto.lib";
list a = 1,5,20,6,37;
find_index(a,20);
==> 3
find_index(a,6);
==> 4
find_index(a,100);
==> 0