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What does this line of code mean in non-code speak?

Asked by J
on 15 Jun 2013
if (div4 & ~( xor(div100, div400)))  

div4 div100 and div400 are given by:

div4 = ((year/4) == floor (year/4));
div100 = ((year/100) == floor (year/100));
div400 = ((year/400) == floor (year/400));



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3 Answers

Answer by Wayne King
on 15 Jun 2013
Edited by Wayne King
on 15 Jun 2013
 Accepted answer

div4, div100, and div400 are all logical variables, 1 or 0.

 if (div4 & ~(xor(div100,div400)))

says "if div4 is true (1) and div100 and div400 are both false or both are true, do something"


equals 1 (true) only if both div100 and div400 are false or both are true


Wayne King
on 15 Jun 2013

right, ~xor(A,B) is true only if both are false or both are true (I forgot the both are true condition)

per isakson
on 15 Jun 2013


    not( [ xor(1,0), xor(0,1), xor(1,1), xor(0,0) ] )


    ans =
         0     0     1     1
on 16 Jun 2013

Many thanks. Couldn't wrap my head around the latter part of it.

Answer by Roger Stafford
on 16 Jun 2013

In other words, this logical statement is true when 'year' is to be a leap year under the Gregorian calendar. They could just as well have written

 if div4&(div100==div400)

or, given the definitions of these quantities,

 if div4&(div100<=div400)

or, again given their definitions, even this

 if div400|(div4~=div100)


Answer by Andrei Bobrov
on 16 Jun 2013


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