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GNU Info (g77-300.info)Ugly Complex Part ExtractionUgly Complex Part Extraction ---------------------------- The `-fugly-complex' option enables use of the `REAL()' and `AIMAG()' intrinsics with arguments that are `COMPLEX' types other than `COMPLEX(KIND=1)'. With `-ff90' in effect, these intrinsics return the unconverted real and imaginary parts (respectively) of their argument. With `-fno-f90' in effect, these intrinsics convert the real and imaginary parts to `REAL(KIND=1)', and return the result of that conversion. Due to this ambiguity, the GNU Fortran language defines these constructs as invalid, except in the specific case where they are entirely and solely passed as an argument to an invocation of the `REAL()' intrinsic. For example, REAL(REAL(Z)) is permitted even when `Z' is `COMPLEX(KIND=2)' and `-fno-ugly-complex' is in effect, because the meaning is clear. `g77' enforces this restriction, unless `-fugly-complex' is specified, in which case the appropriate interpretation is chosen and no diagnostic is issued. Note: CMPAMBIG, for information on how to cope with existing code with unclear expectations of `REAL()' and `AIMAG()' with `COMPLEX(KIND=2)' arguments. Note: RealPart Intrinsic, for information on the `REALPART()' intrinsic, used to extract the real part of a complex expression without conversion. Note: ImagPart Intrinsic, for information on the `IMAGPART()' intrinsic, used to extract the imaginary part of a complex expression without conversion. automatically generated by info2www version 1.2.2.9 |