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9.236 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