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/GNU Fortran 7

9.3 ABS — Absolute value

Description:

ABS(A) computes the absolute value of A.

Standard:

Fortran 77 and later, has overloads that are GNU extensions

Class:

Elemental function

Syntax:

RESULT = ABS(A)

Arguments:
A The type of the argument shall be an INTEGER, REAL, or COMPLEX.
Return value:

The return value is of the same type and kind as the argument except the return value is REAL for a COMPLEX argument.

Example:
program test_abs
  integer :: i = -1
  real :: x = -1.e0
  complex :: z = (-1.e0,0.e0)
  i = abs(i)
  x = abs(x)
  x = abs(z)
end program test_abs
Specific names:
Name Argument Return type Standard
ABS(A) REAL(4) A REAL(4) Fortran 77 and later
CABS(A) COMPLEX(4) A REAL(4) Fortran 77 and later
DABS(A) REAL(8) A REAL(8) Fortran 77 and later
IABS(A) INTEGER(4) A INTEGER(4) Fortran 77 and later
BABS(A) INTEGER(1) A INTEGER(1) GNU extension
IIABS(A) INTEGER(2) A INTEGER(2) GNU extension
JIABS(A) INTEGER(4) A INTEGER(4) GNU extension
KIABS(A) INTEGER(8) A INTEGER(8) GNU extension
ZABS(A) COMPLEX(8) A COMPLEX(8) GNU extension
CDABS(A) COMPLEX(8) A COMPLEX(8) GNU extension

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Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gfortran/ABS.html