Nick Mudge
17 July 2008
I wrote a second parser that parses arithmetic expressions. It implements a pushdown automaton using the C function call stack as the stack. In other words it uses recursive functions. It's 45 percent less code than my last parser and is much more elegant. It also handles nested parentheses correctly.
I hooked it up to the web interface.
Comments
Mike G
20 July 2008 at 12am
Hi, I think there might be an error somewhere. I typed in this (random) expression:
55689*449+332-6522/859*(789-854/235*(6-4*2/3))
and my Es-Calc and Excel both give the value:
24998794.450622900000000000
your web interface is giving:
Answer: 24999254
Good luck fixing it, rather you than me ;-)
20 July 2008 at 12am
Hi, I think there might be an error somewhere. I typed in this (random) expression:
55689*449+332-6522/859*(789-854/235*(6-4*2/3))
and my Es-Calc and Excel both give the value:
24998794.450622900000000000
your web interface is giving:
Answer: 24999254
Good luck fixing it, rather you than me ;-)
Mike G
20 July 2008 at 12am
Might it be the use of atoi() rather than atof() ?
20 July 2008 at 12am
Might it be the use of atoi() rather than atof() ?
Nick Mudge
20 July 2008 at 12am
Thanks.
The program only handles integers and so ignores fractional parts. For instance, 5/2 returns 2 and not 2.5
20 July 2008 at 12am
Thanks.
The program only handles integers and so ignores fractional parts. For instance, 5/2 returns 2 and not 2.5
Ismael Ramirez
12 August 2008 at 12am
It was easier for implementing on PHP than in C?
Thanks for sharing this code!
12 August 2008 at 12am
It was easier for implementing on PHP than in C?
Thanks for sharing this code!
..
15 October 2009 at 2pm
check this ... 5-(10+100) ... wrong output
15 October 2009 at 2pm
check this ... 5-(10+100) ... wrong output
Nick Mudge
15 October 2009 at 3pm
Oh, thanks, I guess I have more work to do.
15 October 2009 at 3pm
Oh, thanks, I guess I have more work to do.
..
15 October 2009 at 4pm
any ideas on when you might fix it?
15 October 2009 at 4pm
any ideas on when you might fix it?
Nick Mudge
15 October 2009 at 5pm
I plan on fixing it tonight. Thanks for your interest. Curious, are you planning on using it for something? If so, that's great.
15 October 2009 at 5pm
I plan on fixing it tonight. Thanks for your interest. Curious, are you planning on using it for something? If so, that's great.
..
15 October 2009 at 6pm
well - i'm using it for something - but had to change a couple of things. I came up with a work around for this issue - but would like to have the tree in the right order though - so if you are fixing it tonight i'll wait
15 October 2009 at 6pm
well - i'm using it for something - but had to change a couple of things. I came up with a work around for this issue - but would like to have the tree in the right order though - so if you are fixing it tonight i'll wait
Nick Mudge
16 October 2009 at 4am
Cool. It's going to take me a little longer. I'm a little rusty. But I plan to have it fixed soon.
16 October 2009 at 4am
Cool. It's going to take me a little longer. I'm a little rusty. But I plan to have it fixed soon.
..
16 October 2009 at 9pm
in any case - thanks a lot - i've fixed it already and implemented power of too.
or and by the way -(10+100) doesn't work neither
16 October 2009 at 9pm
in any case - thanks a lot - i've fixed it already and implemented power of too.
or and by the way -(10+100) doesn't work neither
Nick Mudge
17 October 2009 at 3pm
Great, would you be willing to share your code?
17 October 2009 at 3pm
Great, would you be willing to share your code?
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