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isqrt

(truncated) square root of an integer

Syntax
isqrt(N:INT):INT

Description
This function computes the square root of an integer. If the argument is not a perfect square it returns the integer part of the square root.

Example
/**/  isqrt(16);
4

/**/  isqrt(99);
9

/**/  isqrt(-1);
ERROR: Value must be non-negative
 isqrt(-1);
 ^^^^^^^^^