jshortle@jarthur.Claremont.EDU (John Shortle) (04/20/89)
I have written a simple command-line reverse polish notation calculator in C.
If you want to compute (3 - 4 / 7), for example, you type, 'num 3 4 7 / -'.
It works fine unless you end the command with a plus (+) character. You
must hit return twice, and the program doesn't recognize the plus character
as part of the statement. I wrote a short program to test this oddity.
test.c (compiled with Manx 3.6a):
---
#include <stdio.h>
main (argc, argv)
int argc;
char *argv[];
{
int i;
printf("%d\n", argc);
for (i = 0; i < argc; i++)
printf("%s,", argv[i]);
printf("\n");
}
----
Here are some sample input and output:
>test a -
3
test,a,-,
>test a + (must hit return twice before anything happens)
2
test,a,
>test a +++++ (hit return twice)
3
test,a,++++, (note that one of the plusses is missing)
---
Does anyone know what causes this and/or how to fix it?
Thanks.disd@hubcap.clemson.edu (Gary Heffelfinger) (04/21/89)
From article <905@jarthur.Claremont.EDU>, by jshortle@jarthur.Claremont.EDU (John Shortle): > I have written a simple command-line reverse polish notation calculator in C. > If you want to compute (3 - 4 / 7), for example, you type, 'num 3 4 7 / -'. > It works fine unless you end the command with a plus (+) character. You > must hit return twice, and the program doesn't recognize the plus character > as part of the statement. I wrote a short program to test this oddity. > --- > Does anyone know what causes this and/or how to fix it? '+' means "continued on the next line" to DOS. I don't know how you could get around it. You might have to substitute some other character for the plus sign. Gary -- Gary R Heffelfinger - disd@hubcap.clemson.edu "If it should become necessary to fight, could you arrange to find me some rocks to throw at them?" W.T. Riker
new@udel.EDU (Darren New) (04/22/89)
In article <905@jarthur.Claremont.EDU> jshortle@jarthur.UUCP (John Shortle) writes: >It works fine unless you end the command with a plus (+) character. You >must hit return twice, and the program doesn't recognize the plus character >as part of the statement. I wrote a short program to test this oddity. It seems to be part of the CLI parsing mechanism. For example, try 1> RUN WAIT 10 + ECHO "HELLO" You get the whole command line, and I think there is a newline substituted for the plus. The easiest fix is to put a space after the plus when you type the line. The hardest fix is to patch the CLI, burn new proms, install them, and then fix all the third-party execute scripts that use this feature :-).
cmcmanis%pepper@Sun.COM (Chuck McManis) (04/22/89)
In article <905@jarthur.Claremont.EDU> (John Shortle) writes: >It works fine unless you end the command with a plus (+) character. + on the end of a line is the CLI continuation character. I forget where this was documented but it was there somewhere. This lets you type longer lines especially to things like Alink and the like. So it isn't a bug per say. Since this is the only character that causes this behaviour you could possible assume that if the command line terminated and you still had two numbers on the stack that you should add them. (Ok, ok, just kidding you can put away the tomatoes) :-) --Chuck McManis uucp: {anywhere}!sun!cmcmanis BIX: cmcmanis ARPAnet: cmcmanis@sun.com These opinions are my own and no one elses, but you knew that didn't you. "A most excellent barbarian ... Genghis Kahn!"
fgd3@jc3b21.UUCP (Fabbian G. Dufoe) (04/22/89)
From article <905@jarthur.Claremont.EDU>, by jshortle@jarthur.Claremont.EDU (John Shortle): > I have written a simple command-line reverse polish notation calculator in C. > If you want to compute (3 - 4 / 7), for example, you type, 'num 3 4 7 / -'. > It works fine unless you end the command with a plus (+) character. You > > Does anyone know what causes this and/or how to fix it? > Thanks. AmigaDOS uses the plus (+) sign as a command line continuation symbol. Try typing a space after the plus sign. --Fabbian Dufoe 350 Ling-A-Mor Terrace South St. Petersburg, Florida 33705 813-823-2350 UUCP: ...uunet!pdn!jc3b21!fgd3
ins_adjb@jhunix.HCF.JHU.EDU (Daniel Jay Barrett) (04/23/89)
In article <905@jarthur.Claremont.EDU> jshortle@jarthur.UUCP (John Shortle) writes: >I have written a simple command-line reverse polish notation calculator in C. >It works fine unless you end the command with a plus (+) character. You >must hit return twice, and the program doesn't recognize the plus character >as part of the statement.... I'm not sure if this will help, but the '+' character is recognized by AmigaDOS (at least for the "Run" command) as a command continuation symbol. If you end a command line with a plus sign, the CLI expects that the command isn't finished, and the rest of the command will follow on the next line. I thought this was only for commands that are "Run", though. -- # Dan Barrett barrett@cs.jhu.edu (128.220.13.4) ARPANET # # ins_adjb@jhuvms.bitnet BITNET # # ins_adjb@jhunix.UUCP UUCP (unreliable) # # Dept. of Computer Science, Johns Hopkins University, Baltimore, MD 21218 #