インテル® Fortran コンパイラー 19.0 デベロッパー・ガイドおよびリファレンス

SIGN

Elemental Intrinsic Function (Generic): Returns the absolute value of the first argument times the sign of the second argument.

result = SIGN (a, b)

a

(Input) Must be of type integer or real.

b

(Input) Must have the same type as a.

Results

The result type and kind are the same as a. The value of the result is as follows:

The specific named versions of the function require that the arguments have the same kind parameters.

Specific Name

Argument Type

Result Type

BSIGN

INTEGER(1)

INTEGER(1)

IISIGN1

INTEGER(2)

INTEGER(2)

ISIGN 2

INTEGER(4)

INTEGER(4)

KISIGN

INTEGER(8)

INTEGER(8)

SIGN 3

REAL(4)

REAL(4)

DSIGN 3,4

REAL(8)

REAL(8)

QSIGN

REAL(16)

REAL(16)

1 Or HSIGN.

2 Or JISIGN. For compatibility with older versions of Fortran, ISIGN is treated as a generic function.

3 The setting of compiler options specifying real size can affect SIGN and DSIGN .

4 The setting of compiler options specifying double size can affect DSIGN.

Example

SIGN (4.0, -6.0) has the value -4.0.

SIGN (-5.0, 2.0) has the value 5.0.

The following shows another example:

 c = SIGN (5.2, -3.1)   ! returns -5.2
 c = SIGN (-5.2, -3.1)  ! returns -5.2
 c = SIGN (-5.2, 3.1)   ! returns  5.2

See Also