User:Yeti

My Sandbox

I need to get used to this flavour of markup first. That'll take some time. Meanwhile I collect my examples here. If you think, some example is worth being moved to the "right" place, feel free to do so and leave me a note...

---

DC/Questions/DROP

TODO Drop top of stack without side effects

# assume there is a value in x[1337], e.g. "gold"
[gold] 1337 :x

# "trash" on the stack:
[trash]

# push x[1337] to x-stack
1337;x Sx
# deposit TOS in x[1337]
1337:
# top of x-stack to x[1337]
Lx 1337:

1337 ;x

[Stack: ]PAP f

Output:

Stack: 
gold

Sigh!

Is there really no simpler way to drop the top of stack that works for strings and numbers and in all versions of Dc?

Python/Primes/FSOE

Works with: Python version 2.x

This is a sequentialised variant of the well known sieve method (ab)using a dictionary as sparse array. <lang python>L = {} n = 2

while 1:

       if n in L:
               P = L[n]
               del L[n] # optional - saves some memory.
       else:
               print n
               P = [n]

       for p in P:
               npp = n+p
               if npp in L:
                       L[npp].add(p)
               else:
                       L[npp] = set([p])

       n += 1</lang>

Output:

2
3
5
7
11
13
17
19
23
29

...the program has to be terminated by the user e.g. by typing ctrl-c.

---

My Favorite Languages
Language	Proficiency
AWK	---
C	---
Dc	---
Spin	---