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Mulitple conditionals [message #64975]

Sat, 07 February 2009 03:32

Bernhard Reinhardt
Messages: 26
Registered: October 2008

Junior Member

Hi,

I guess I can not shock you IDL old stagers with this but for an IDL
newbee like me this seems quite strange:

IDL> if 1 eq (1 or 2) then print, "true" else print, "false"
false
IDL> if "a" eq ("a" or "b") then print, "true" else print, "false"
true

Maybe thats the IDL-way of punishing people to addle to type the long
version:

IDL> if ("a" eq "a" or "a" eq "b") then print, "true" else print,"false"
true
IDL> if (1 eq 1 or 1 eq 2) then print, "true" else print, "false"
true

Can anyone explain the logic behind this behavoir to me?

Regards

Bernhard

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