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Why is it equal to 0 ? Thank you

% is for displaying remainders. So if something perfectly divides into another it should return 0.

4 divided by 2 = 2 ( 4 % 2 = 0 ) 5 divided by 2 = 2 with 1 remainder ( 5 % 2 = 1 )

Equal to 0 means its completely divisible. "%" operator returns the remainder when a dividend is divided by divisor. For example:

10 (dividend) % 3 (Divisor) will return 1 as Remainder. This is because

10 (dividend) = 3(Divisor) * 3 (Quotient) + 1 (Remainder)

So if a number is not completely divisible then "%" operator will return some value as there will be something in remainder.

Example of Completely Divisible

10 (dividend) % 2 (Divisor) will return 0 as Remainder. This is because

10 (dividend) = 2 (Divisor) * 5 (Quotient) + 0 (Remainder)

I hope this answers why we check for is equal to 0 for checking if number is completely divisible.