Large prime check(using sieve)

#1

In this particular video when the instructor has tested the isPrime function for 2147483618,shouldn’t it show no it is not,rather the output is yes it is.
And also what does this statement do exactly?
return b[i]==1?true:false in the bool isPrime function

#2

hello @armaanbhardwaj23

he tested for 2147483647 which is a prime number hence output was yes

this is ternary operator. here this statemnt will true if b[i]==1

otherwise it will return false

#3

I know about the ternary operator but am not sure about the use of the b[i] in this statement,what does it signify basically?Does it mean that if the bit at the i’th number is 1,then return true otherwise false?

#4

yeah . … . right …

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#5

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#6

hi aman i think armaan is saying right for 21474831618 it is showing prime which is wrong