Questions tagged [postfix]
10 questions
57
votes
15 answers
Why do we have postfix increment?
Disclaimer: I know perfectly well the semantics of prefix and postfix increment. So please don't explain to me how they work.
Reading questions on stack overflow, I cannot help but notice that programmers get confused by the postfix increment…
fredoverflow
- 6,954
28
votes
11 answers
Avoid Postfix Increment Operator
I've read that I should avoid the postfix increment operator because of performance reasons (in certain cases).
But doesn't this affect code readability? In my opinion:
for(int i = 0; i < 42; i++);
/* i will never equal 42! */
Looks better…
Mateen Ulhaq
- 973
6
votes
2 answers
Postfix vs Prefix
I have read at a few places, that Postfix is easier to evaluate & easier to convert to Code than Prefix.
I understand that if you parse a prefix expression from left to right, you might not be able to evaluate directly(as some operands might be…
nikel
- 169
6
votes
2 answers
why use postfix /prefix expression instead of infix?
I understand how to convert infix to postfix/prefix but I do not understand why postfix or prefix expression are used in computer system?
What is the advantage of postfix prefix over infix expression?
Joydip Ghosh
- 87
5
votes
1 answer
Is it worth parsing an infix algebraic expression to postfix and then an expression tree?
I am trying to make a simple expression parser, in which users type an expression in infix notation (for example ln((1+2)(3-4))) to apply some calculations. To make this possible I need to tokenize the expression as a expression tree. I've read in…
JulianSoto
- 153
4
votes
2 answers
Variable assignment in a postfix language
TL;DR is val name <- more readable than name val <-?
I'm designing a semi-concatenative, postfix language. I haven't given much thought to the style in which variable are assigned, and now I see that there are two (main) ways to do it. Originally, a…
Conor O'Brien
- 159
3
votes
8 answers
Are there real world applications where the use of prefix versus postfix operators matters?
In college it is taught how you can do math problems which use the ++ or -- operators on some variable referenced in the equation such that the result of the equation would yield different results if you switched the operator from postfix to prefix…
Kenneth
- 2,701
1
vote
1 answer
How do I interpret this postfix right-to-left algorithm?
I'm trying to implement this right-to-left evaluation algorithm of a postfix expression but I can't seem to get it to work.
for each token in the reversed postfix expression:
if token is an operator:
push token onto the operator stack
…
CervEd
- 121
1
vote
7 answers
Algorithm for recursive evaluation of postfix expressions
I'm reading Sedgewick's book on algorithms in C and I'm looking for an algorithm to evaluate postfix expressions (addition and multiplication only) without using a stack. I tried to implement one but I always get nowhere.
I have a simple C…
caisah
- 113
0
votes
1 answer
LDAP with Dovecot
I have a mail server setup with Postfix and Dovecot, and an application server setup with node.js. I have user credentials stored in my application server, and I want to use the same credentials for accessing the mail server. As I understand it, I…
penalosa
- 439
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