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From: Les Neilson on 14 May 2010 07:19 "Louis Krupp" <lkrupp_nospam(a)indra.com.invalid> wrote in message news:2vGdnSF349lYvXDWnZ2dnUVZ_gSdnZ2d(a)indra.net... > On 5/13/2010 9:44 PM, Uno wrote: >> Richard Maine wrote: >>> Uno <merrilljensen(a)q.com> wrote: >>> >>>> I can't imagine the circumstance when a person would have to work >>>> around >>>> a hollerith constant. >>> >>> I'm afraid would ascribe that mostly to a failure of imagination. > <snip> >> My imagination is just fine, Richard ... > <snip> > > Perhaps imagination is the wrong word; how about "life experience"? > > Can you conceive of: > > Black & white TV? > > Postal zones instead of zip codes? > > Party lines (hint: they're not something you snort)? > > Rotary telephones? > > Punched cards? > > Radios with vacuum tubes instead of transistors? > > Twenty shillings to a pound, and twelve pence to a shilling? > > Hollerith constants will be on that list some day. > > Louis Oh my. I had d�j� vu all over again :-) Les
From: Terence on 15 May 2010 06:51 Nostalgia! There was a heck of a lot of weird Hollerith in the DEC versions of the 66 BMD programas I recovered and re-wrote. IBM's Fortran IV squeezed 4 charactaers into a real variable (apparent preference, rather than integer), But DEC tried to get away with 5 in their 36-bit registers (7 bits ascii?). That was actually the first time I had to really count characters (and over two lines often) when converting to string literals. Anyway 'tis done and they work.
From: Uno on 15 May 2010 19:13 On 5/15/2010 5:51 AM, Terence wrote: > Nostalgia! > There was a heck of a lot of weird Hollerith in the DEC versions of > the 66 BMD programas I recovered and re-wrote. IBM's Fortran IV > squeezed 4 charactaers into a real variable (apparent preference, > rather than integer), But DEC tried to get away with 5 in their 36-bit > registers (7 bits ascii?). That was actually the first time I had to > really count characters (and over two lines often) when converting to > string literals. > Anyway 'tis done and they work. I'm sure they do. Let's maybe take another look at the program on the wiki: Dir for this script: E:\fortran_stuff\ E:\fortran_stuff>gfortran -Wall -Wextra -ffixed-form -o out.exe holl1.for holl1.for:4.35: DATA IHWSTR/4HHELL,4HO WO, 3HRLD/ 1 Warning: Extension: Hollerith constant at (1) holl1.for:4.20: DATA IHWSTR/4HHELL,4HO WO, 3HRLD/ 1 Warning: Extension: Conversion from HOLLERITH to INTEGER(4) at (1) holl1.for:4.27: DATA IHWSTR/4HHELL,4HO WO, 3HRLD/ 1 Warning: Extension: Conversion from HOLLERITH to INTEGER(4) at (1) holl1.for:4.35: DATA IHWSTR/4HHELL,4HO WO, 3HRLD/ 1 Warning: Extension: Conversion from HOLLERITH to INTEGER(4) at (1) E:\fortran_stuff>out HELLO WORLD E:\fortran_stuff>type holl1.for C PROGRAM HELLO1 C INTEGER IHWSTR(3) DATA IHWSTR/4HHELL,4HO WO, 3HRLD/ C WRITE (6,100) IHWSTR STOP 100 FORMAT (3A4) END C gfortran -Wall -Wextra -ffixed-form -o out.exe holl1.for E:\fortran_stuff> What a clever little program and excellent way to show this material to people who are younger. How dependent is this scheme on integers having a width of four? -- Uno
From: Uno on 15 May 2010 19:24 On 5/14/2010 5:07 AM, Louis Krupp wrote: > On 5/13/2010 9:44 PM, Uno wrote: >> Richard Maine wrote: >>> Uno <merrilljensen(a)q.com> wrote: >>> >>>> I can't imagine the circumstance when a person would have to work >>>> around >>>> a hollerith constant. >>> >>> I'm afraid would ascribe that mostly to a failure of imagination. > <snip> >> My imagination is just fine, Richard ... > <snip> > > Perhaps imagination is the wrong word; how about "life experience"? > > Can you conceive of: > > Black & white TV? > > Postal zones instead of zip codes? > > Party lines (hint: they're not something you snort)? > > Rotary telephones? > > Punched cards? > > Radios with vacuum tubes instead of transistors? > > Twenty shillings to a pound, and twelve pence to a shilling? > > Hollerith constants will be on that list some day. > > Louis These were things that disappeared in my youth. We had a party line when we moved to Ohio in '72. But that didn't bother me because I wouldn't call anyone whom I would otherwise see in elementary school the next day. One thing that *did* bother me was watergate, because it interrupted my cartoons. -- Uno
From: Uno on 15 May 2010 19:47
On 5/13/2010 10:44 PM, Uno wrote: > In this program, nothing is declared explicitly, so how can you know > what is a hollerith constant and what isn't? > > C PROGRAM HELLO1 > C > INTEGER IHWSTR(3) > DATA IHWSTR/4HHELL,4HO WO, 3HRLD/ > C > WRITE (6,100) IHWSTR > STOP > 100 FORMAT (3A4) > END > I was wrong that nothing's declared. What I couldn't see was that everything was declared. If you don't know what the basic hollerith idea is, it's quite the eye twister. The space in '4HO WO' is particularly eye-bending. I think this version is better: E:\fortran_stuff>gfortran -Wall -Wextra -ffixed-form -o out.exe holl1.for E:\fortran_stuff>out HELLO WORLD E:\fortran_stuff>type holl1.for C PROGRAM HELLO1 C IMPLICIT NONE INTEGER IHWSTR(3) DATA IHWSTR/4HHELL,4HO WO, 3HRLD/ C WRITE (6,100) IHWSTR STOP 100 FORMAT (3A4) END C gfortran -Wall -Wextra -ffixed-form -o out.exe holl1.for E:\fortran_stuff> -- Uno |