Doubt in line sum=(sum+n)%n of code

#1

if value of sum is greater than value of n in -ve then adding n to it will also make sum still -ve i cannot understand this line

#2

no if suppose that result is -2 and if you add n to it i.e5 then -2+5 is 3 which is positive .
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#3

i mean if n=5 and sum=-7 then sum + n =-2 .so sum will still be -ve only .so why do we add n to sum then

#4

here you are assuming this case yourself or this is the sample case somewhere in the case.
because we are taking mod of sum with n i guess so sum will never be greater then n .
so i dont think this could be the case which can arise .

#5

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