Sample for J

samples/J/stwij.ijs

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+NB. From "Continuing to write in J".
+NB. See http://www.jsoftware.com/help/jforc/continuing_to_write_in_j.htm
+
+empno=: 316 317 319 320
+payrate=: 60 42 44 54
+billrate=: 120 90 90 108
+clientlist=: 10011 10012 10025
+emp_client=: 10012 10025 10012 10025
+hoursworked=: 4 31 $ 8 0 3 10 9 8 8 9 4 0 8 7 10 10 12 9 0 6 8 9 9 9 0 0 10 11 9 7 10 2 0 8 0 0 9 9 8 9 10 0 0 8 8 10 7 10 0 0 7 8 9 8 9 0 4 9 8 9 8 9 0 0 5 0 0 8 9 9 9 9 0 0 8 7 0 0 9 0 2 10 10 9 11 8 0 0 8 9 10 8 9 0 0 9 0 0 9 10 8 6 6 8 0 9 8 10 6 9 7 0 6 8 8 8 9 0 5 8 9 8 8 12 0 0
+
+NB. Finds the number of hours each employee worked in the given month.
+emphours=: 3 : '+/"1 hoursworked'
+
+NB. Determines the wages earned by each employee in the given month.
+empearnings=: 3 : 'payrate * +/"1 hoursworked'
+
+NB. Determines the profit brought in by each employee.
+empprofit=: 3 : 0
+(billrate - payrate) * +/"1 hoursworked
+)
+
+NB. Returns the amount to bill a given client.
+billclient=: 3 : 0
+mask=. emp_client = y
++/ (mask # billrate) * +/"1 mask # hoursworked
+)
+
+NB. Finds for each day of the month the employee who billed the most hours.
+dailydrudge=: 3 : 0
+((|: hoursworked) i."1 0 >./ hoursworked) { empno
+)
+
+NB. Returns the employees, in descending order of the profit brought in by each.
+producers=: 3 : 'empno \: empprofit 0'
+
+NB. Returns the clients, in descending order of the profit generated by each.
+custbyprofit=: 3 : 0
+clientlist \: +/ (clientlist ="1 0 emp_client) * empprofit 0
+)
+
+NB. Calculates withholding tax on each employee's earnings.
+renderuntocaesar=: 3 : 0
+bktmin=. 0 6000 10000 20000     NB. Four brackets, 0..6000..10000..20000.._
+bktrate=. 0.05 0.10 0.20 0.30
+bktearns=. 0 >. ((1 |.!._ bktmin) <."1 0 empearnings'') -"1 bktmin
++/"1 bktrate *"1 bktearns
+)
+
+NB. Main
+
+echo 'Problem 1'
+echo emphours''
+
+echo 'Problem 2'
+echo empearnings''
+
+echo 'Problem 3'
+echo empprofit''
+
+echo 'Problem 4'
+echo billclient 10025
+
+echo 'Problem 5'
+echo dailydrudge''
+
+echo 'Problem 6'
+echo producers''
+
+echo 'Problem 7'
+echo custbyprofit''
+
+echo 'Problem 8'
+echo 0j2 ": renderuntocaesar''