patrickbucher

- Software consists of algorithms and data structures. (Niklaus Wirth published
  a book called _Algorithms = Data Structures = Programs_.)
- Algorithms work on data structures by manipulating them in place or by
  transforming them into other data structures.
- Data structures are usually the starting and end point of a program.
  Exceptions are programs that make up their own data (e.g. by generating
  random data or by gathering measurements of sensors), but even then the
  definition of the data structures predates the algorithm.
- The data structure an algorithm works on shall be called an _input data
  structure_, and a data structure an algorithm is producing shall be called an

patrickbucher

#!/usr/bin/awk
# sumtime.awk: sums up times
#   input: lines with time indications of the form hh:mm, e.g. 12:30 or 4:15
#   output: the sum of the times, e.g. 16:45

/[0-9]{1,}:[0-9]{1,2}/ {
    split($0, fields, ":")
    hours += fields[1]
    minutes += fields[2]
}

patrickbucher

package main

import (
	"os"
	"text/template"
	"time"
)

type Article struct {
	Title     string

patrickbucher

systemd-analyze dot --to-pattern='*.service' | \
  sed '2i graph[overlap=false dpi=150]; node[fontname="monospace" shape=rect];' | \
  nop | \ # obsessive-compulsive disorder
  twopi -Tpng > systemd.png

patrickbucher

Shared Libraries

Go to /home/user/libraries for this example:

$ mkdir /home/user/libraries
$ cd /home/user/libraries

Code

Library header (fib.h):

patrickbucher

#!/usr/bin/env python3

from functools import reduce


def sieve(xs):
    return reduce(
        lambda primes, x: primes + [x]
        if not any(filter(lambda p: x % p == 0, primes))
        else primes,

patrickbucher

#!/usr/bin/env python3

import re
import sys

from huffman import Node
from huffman import count_frequencies 
from huffman import build_tree

import pydot

patrickbucher

#!/usr/bin/env python3

from collections import namedtuple

from bitstream import BitStream


Node = namedtuple('Node', 'chars weight left right')

left = False

patrickbucher

Was bedeutet «Cloud Computing»?
Patrick Bucher, Modul 346, BBZW Sursee
2022-12-15

[Hierbei handelt es sich um eine unautorisierte Übersetzung. Die selben
Begriffe im Original wurden je nach Kontext und Bedarf anders übersetzt.
Bei ambivalenten Übersetzungen wird der englische Originalbegriff in
Klammern und kursivgesetzt angegeben.]

Cloud Computing ist ein Modell zur Ermöglichung eines allgegenwärtigen

patrickbucher

package main

import (
	"errors"
	"fmt"
)

type Number float64

type Operator func(Number) Number