Programming loops?

kabik334Bykabik334

Can you generally say when you should use a while loop and when you should use a for loop? When you should use the = condition, and when it makes sense to use unequals? It works both ways. Depending on the situation, one is easier. I'm always lacking the right approach to simple programming tasks. This would help me.

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Pantoffelhelm
Pantoffelhelm
1 year ago

While it should be repeated infinitely or so it will run until aroundy is reached. For if it is possible to determine how often this should be repeated or to run in skipping steps. Pinzipiell, however, is only the skipping as while loop bad to represent. Whether = or != depends on what you want. You can always only use one if you write in front of one of the terms.

Give me a job so that I can show it applied

2
kabik334
Author
kabik334
1 year ago
Reply to  Pantoffelhelm

here e.g. the task :A text T is given as an array of characters (char array). Z.b: T[] = {W,a,s, ,g,e,h,t, ,a,b} a) Write a function in C to count and return the frequency of a character c in T. b) Write a function to find the first occurrence of a word w (also a char array) in T. The function is to return the index at which the word begins. And thanks

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guenterhalt
guenterhalt
1 year ago

It doesn’t matter. Both are equal. It is the readability of the code that decides the choice.

1
xTheForza
xTheForza
1 year ago

for loops you should use if you show how often you want to perform a specific action, for example for each element in an array.

While grinding, you should use if you don’t know how often you will perform an action, for example if you expect a correct input from a user and he should try it again when entering incorrectly.

3
Erzesel
Erzesel
1 year ago

A For loop is used when the loop head is already fixed, as often the loop hull is passed through.

The fixing of the loops to be traversed is defined outside the loop hull.

*Powershell

$x = 5  #Anzahl der Loops außerhalb des Loops  festlegen...
  #hier steht von vornherein fest das die Schleife x-mal   durchlaufen  wird
for ($i= 0 ; $i -lt $x ; ++$i) {
    Write-Host $i
}

A While/Until loop is used if the abort condition is not yet available when entering the loop hull (i.e. is only available by actions within the loop).

 #der Wert der Abbruchbedingung ist hier  noch nicht verfügbar
While ($var -ne 6) {
    $var = 1..6|Get-Random  #zahlvon 1 bis 6  Würfeln
    Write-Host $var gewuerfelt
}
Write-Host 'eine 6 wurde gewuerfelt' -fo green

…We don’t know how many times we have to be diceed until a 6 falls. So our loop only reacts to an inside change of value!

0