CODEWITHSUNDEEP
j
Ellie Y
Ellie Y

Reputation: 119

Define a verb Centigrade in J programming

When defining the verb centigrade to convert its argument from a Fahrenheit to a centigrade, the code in the book 'J Primer' is:

   centigrade =. 3 : 0
t1 =. y. - 32
t2 =. t1 * 5
t3 =. t2 % 9
)

However, I had the spelling error in 'y.' part. But when I type 'y' instead of 'y.' in the definition, it works. 

   centigrade =. 3 : 0
t1 =. y - 32
t2 =. t1 * 5
t3 =. t2 % 9
)

Why is that? Thanks!

Upvotes: 2

Views: 100

Answers (1)

bob
bob

Reputation: 4302

Originally, the J language used x. and y. for the internal arguments to an explicit verb. You can reset to allow for y. or x. if you want to use legacy code by using the foreign conjunction 9!:49

9!:49 [ 0 for not accepting y. 9!:49 [ 1 for accepting y. 9!:48 '' gives the current status of the flag. http://www.jsoftware.com/help/dictionary/dx009.htm (bottom of page)

   test=: 3 : 'x. + y.'
|spelling error
|   x. + y.
|   ^
|   test=:3     :'x. + y.'
   9!:49 [ 1

   test=: 3 : 'x. + y.'
   9!:49 [ 0

   test=: 3 : 'x. + y.'
|spelling error
|   x. + y.
|   ^
|   test=:3     :'x. + y.'

Upvotes: 2

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