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/GNU Fortran 7

9.245 SIGN — Sign copying function

Description:

SIGN(A,B) returns the value of A with the sign of B.

Standard:

Fortran 77 and later

Class:

Elemental function

Syntax:

RESULT = SIGN(A, B)

Arguments:
A Shall be of type INTEGER or REAL
B Shall be of the same type and kind as A
Return value:

The kind of the return value is that of A and B. If B\ge 0 then the result is ABS(A), else it is -ABS(A).

Example:
program test_sign
  print *, sign(-12,1)
  print *, sign(-12,0)
  print *, sign(-12,-1)

  print *, sign(-12.,1.)
  print *, sign(-12.,0.)
  print *, sign(-12.,-1.)
end program test_sign
Specific names:
Name Arguments Return type Standard
SIGN(A,B) REAL(4) A, B REAL(4) f77, gnu
ISIGN(A,B) INTEGER(4) A, B INTEGER(4) f77, gnu
DSIGN(A,B) REAL(8) A, B REAL(8) f77, gnu

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