$rand » History » Revision 2
Revision 1 (Per Amundsen, 08/11/2015 10:49 AM) → Revision 2/5 (Paul Janson, 12/25/2018 05:45 AM)
_Added in 1.9.0_ *$rand(v1,v2)* Returns a random number or letter between v1 and v2. _Same as [[$r]]._ *Parameters* if v1 and v2 are both numeric, returns random - Start number in that range or letter [0-9A-Za-z]. otherwise returns a character in the range of characters v1 and v2 valid - End number range -2^63 through 2^63-1 or letter [0-9A-Za-z]. *Example* <pre> ; Get a random number between 10 and 100. //echo -ag $rand(10,100) ; Get a random number between -10 and +10. //echo -ag $rand(10,-10) ; Get a random letter between g and y. //echo -ag $rand(g,y) ; Get a random character between A and z. Since 'A' is codepoint 65 and 'z' is codepoint 122, this includes non-alphanumeric codepoints 91-96 [\]^_` //echo -ag $rand(A,z) To obtain only the 52 case-insensitive characters: //echo -a $iif($rand(0,1),$rand(A,Z),$rand(a,z)) Numeric includes numbers at the beginning of strings. //echo -a $rand(1X,4X) is the same as $rand(1,4) Only 1st character of non-numeric string is used. //echo -a $rand(AB,CD) is in the range A through C No 'good' random number generator creates equal outcome of all numbers in the range, but they should be fairly close to the average //hfree -w test | hmake test | var %i 100000 | while (%i) { hinc test $rand(1,100)) | dec %i } | var %i 1 , %a | while (%i isnum 1-100) { var %a %a %i $+ = $+ $hget(test,%i) | inc %i } | echo -a %a </pre>