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isqrt

isqrt(n)

Integer square root: the largest integer m such that m*m <= n.

Examples

1. Calculate the integer square root of a number:

   julia> isqrt(25)
   5
   
   julia> isqrt(37)
   6

   This example calculates the integer square root of the given numbers 25 and 37, returning the largest integer m such that m * m <= n.

2. Handle perfect square numbers:

   julia> isqrt(16)
   4
   
   julia> isqrt(100)
   10

   When the input number is a perfect square, the integer square root is the exact square root value.

3. Calculate the integer square root of large numbers:

   julia> isqrt(10000000000000000000000000000000000000000000000000000000000000000000)
   316227766016837933199889354443271853371955513932521682685750485607663030888

   The isqrt function can handle large numbers and still provide accurate results.

Common mistake example:

julia> isqrt(3.14)
ERROR: MethodError: no method matching isqrt(::Float64)

In this example, the isqrt function is called with a floating-point number. However, isqrt only works on integers, so passing a float will result in a MethodError. Make sure to provide an integer as the argument to isqrt.

See Also

User Contributed Notes

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