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
Elemental Intrinsic Function (Generic): Computes an absolute value.
result=ABS(a)
a |
(Input) Must be of type integer, real, or complex. |
The result has the same type and kind type parameter as a except if a is complex value, the result type is real. If a is an integer or real value, the value of the result is | a |; if a is a complex value (X, Y), the result is the real value SQRT (X**2 + Y**2).
Specific Name |
Argument Type |
Result Type |
|---|---|---|
BABS |
INTEGER(1) |
INTEGER(1) |
IIABS1 |
INTEGER(2) |
INTEGER(2) |
IABS 2 |
INTEGER(4) |
INTEGER(4) |
KIABS |
INTEGER(8) |
INTEGER(8) |
ABS |
REAL(4) |
REAL(4) |
DABS |
REAL(8) |
REAL(8) |
QABS |
REAL(16) |
REAL(16) |
CABS 3 |
COMPLEX(4) |
REAL(4) |
CDABS4 |
COMPLEX(8) |
REAL(8) |
CQABS |
COMPLEX(16) |
REAL(16) |
1Or HABS. 2Or JIABS. For compatibility with older versions of Fortran, IABS can also be specified as a generic function, which allows integer arguments of any kind and produces a result of type default INTEGER. 3The setting of compiler options specifying real size can affect CABS, making CABS generic, which allows a complex argument of any kind to produce a result of default REAL. 4This function can also be specified as ZABS. |
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ABS (-7.4) has the value 7.4.
ABS ((6.0, 8.0)) has the value 10.0.
The following ABS.F90 program calculates two square roots, retaining the sign:
REAL mag(2), sgn(2), result(2)
WRITE (*, '(A)') ' Enter two signed magnitudes: '
READ (*, *) mag
sgn = SIGN((/1.0, 1.0/), mag) ! transfer the signs to 1.0s
result = SQRT (ABS (mag))
! Restore the sign by multiplying by -1 or +1:
result = result * sgn
WRITE (*, *) result
END