SQRT

Elemental Intrinsic Function (Generic): Derives the square root of its argument.

Syntax

result = SQRT (x)

x
(Input) must be of type real or complex. If x is type real, its value must be greater than or equal to zero.

Results:

The result type is the same as x. The result has a value equal to the square root of x. A result of type complex is the principal value, with the real part greater than or equal to zero. When the real part of the result is zero, the imaginary part is greater than or equal to zero.

Specific Name Argument Type Result Type
SQRTREAL(4) REAL(4)
DSQRTREAL(8) REAL(8)
QSQRT 1 REAL(16) REAL(16)
CSQRT 2COMPLEX(4) COMPLEX(4)
CDSQRT 3 COMPLEX(8) COMPLEX(8)
CQSQRT 1 COMPLEX(16) COMPLEX(16)
1 VMS and U*X
2 The setting of compiler option /real_size can affect CSQRT.
3 This function can also be specified as ZSQRT.

Compatibility

CONSOLE STANDARD GRAPHICS QUICKWIN GRAPHICS WINDOWS DLL LIB

Examples

SQRT (16.0) has the value 4.0.

SQRT (3.0) has the value 1.732051.

The following shows another example:

 ! Calculate the hypotenuse of a right triangle
 ! from the lengths of the other two sides.
 REAL sidea, sideb, hyp
 sidea = 3.0
 sideb = 4.0
 hyp = SQRT (sidea**2 + sideb**2)
 WRITE (*, 100) hyp
 100 FORMAT (/ ' The hypotenuse is ', F10.3)
 END