square number

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[wispy lintel]

!cppref sqrt

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cppreference.com

std::sqrt, std::sqrtf, std::sqrtl

float sqrt(float arg);
// ... and 5 more

Defined in

<cmath>

[wispy lintel]

so what part are you struggling with?

checking if it's a square numbers is quite simple when you have the square root

and what is your code so far

can't help you without seeing any code

[swift spoke]

also debugging is important, it's very easy and a great help for finding issues

[quick ruin]

sqrt() has some very heavy requirements on correctness (compared to other math functions). It is also usually hardware implemented (sqrtss/sqrtsd). With NaN/inf checks it takes usually less than 16 cycles on modern architectures to get the results. (Sqrt itself having usually ~12 cycles latency).

So checking against square root is the easiest and fastest way

I played around it a bit some time ago, if you expect your numbers not to be square most of the time here is an interesting trick:
https://github.com/Kaznov/imath/blob/master/imath.h#L1287

(just me posting stuff for other people that might be interested)

[wispy lintel]

we should make a solution for arbitrary sizes of integers

I want all of the experts in here now

square-number-checking has turned out to be an avengers-level problem

[raven spire]

Hi.

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