CODEWITHSUNDEEP
idl-programming-language
SUV
SUV

Reputation: 53

Printing error in IDL: 32700+99

If I print 32700+99 in IDL it gives me -32737 but 33700.0+99 gives me 33799.0. Why is IDL print wrong for 32700+99? Of course 32700.+99 gives, 32799.0, right answer.

Upvotes: 0

Views: 42

Answers (1)

mgalloy
mgalloy

Reputation: 2386

The default integer in IDL is 16-bit, so the largest expressible integer is 32767.

IDL> print, 32767
   32767
IDL> print, 32767 + 1
  -32768

Floats, of course, can handle values in this range. To get a 32-bit integer, use the "L" suffix:

IDL> print, 32767L
       32767
IDL> print, 32767L + 1
       32768

Upvotes: 1

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