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### 8.257 `SQRT` — Square-root function

Description:
  `SQRT(X)` computes the square root of X.
Standard:
  Fortran 77 and later
Class:
  Elemental function
Syntax:
  `RESULT = SQRT(X)`
Arguments:

  X | The type shall be `REAL` or `COMPLEX`.

Return value:
  The return value is of type `REAL` or `COMPLEX`. The kind type parameter is the same as X.
Example:

                program test_sqrt
                  real(8) :: x = 2.0_8
                  complex :: z = (1.0, 2.0)
                  x = sqrt(x)
                  z = sqrt(z)
                end program test_sqrt

Specific names:

  Name | Argument | Return type | Standard
  --- | --- | --- | ---
  `SQRT(X)` | `REAL(4) X` | `REAL(4)` | Fortran 77 and later
  `DSQRT(X)` | `REAL(8) X` | `REAL(8)` | Fortran 77 and later
  `CSQRT(X)` | `COMPLEX(4) X` | `COMPLEX(4)` | Fortran 77 and later
  `ZSQRT(X)` | `COMPLEX(8) X` | `COMPLEX(8)` | GNU extension
  `CDSQRT(X)` | `COMPLEX(8) X` | `COMPLEX(8)` | GNU extension