Questions tagged [loops]
A **loop** is a sequence of statements which is specified once but which may be carried out several times in succession.
13
questions
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votes
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answers
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How to write correct loops?
Most of time while writing loops I usually write wrong boundary conditions(eg: wrong outcome) or my assumptions about loop terminations are wrong(eg: infinitely running loop). Although I got my ...
- 2,176
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votes
2
answers
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General way to convert a loop (while/for) to recursion or from a recursion to a loop?
This problem is mainly focusing on the algorithm, maybe something abstract and more academic.
The example is offering a thought, I wanna a generic way, so example is only used as to make us more ...
- 543
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votes
6
answers
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views
Why are nested loops considered bad practice?
My lecturer mentioned today that it was possible to "label" loops in Java so that you could refer to them when dealing with nested loops. So I looked up the feature as I didn't know about it and many ...
- 643
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votes
5
answers
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Does it make a difference if I declare variables inside or outside a loop in Java?
Does it make a difference if I declare variables inside or outside a loop in Java?
Is this
for(int i = 0; i < 1000; i++) {
int temp = doSomething();
someMethod(temp);
}
equal to this (with ...
- 1,555
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votes
11
answers
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Is there anything that can be done with recursion that can't be done with loops?
There are times where using recursion is better than using a loop, and times where using a loop is better than using recursion. Choosing the "right" one can save resources and/or result in fewer lines ...
- 1,269
57
votes
6
answers
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Who created the idea(s) of the first loop constructs?
while (1) {
if (1+1==2) {
print "Yes, you paid attention in Preschool!";
} else {
print "Wait... I thought 1+1=2";
}
}
As a developer, we all have to use ...
- 5,756
21
votes
1
answer
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What is priming the pump? Sometimes called a priming read
I was taught this expression and pattern way back in the day. Sure, the name comes from old pumps that needed to be filled with water before they could pump water, but who cares? We're talking about ...
- 111k
2
votes
2
answers
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Is there a difference between declaring variables outside or inside a loop? [closed]
Is there any difference if I were to write something like this:
int row,col;
for(row = 0; row < data.length; row++){
for(col = 0; col < data[row].length;col++){
//do ...
- 31
13
votes
7
answers
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views
Best practice to "continue" from inside a nested loop?
Here is a simplified sample. Basically, it does checks on a string from a string list. If the check passes, it will remove that string (filterStringOut(i);), and it is no longer ...
- 3,613
10
votes
4
answers
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Is it a performance hit to create threads that loop a lot to check for things?
This is a generic question that I've always wondered.
In general, is it intensive for a CPU to create threads that perform "while not true ..." loops or similar?
For example, suppose I do:
// ...
- 3,478
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votes
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answers
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Declaring functions in order to avoid explicit nested loops
My programming professor has told me that it is a good programming practice (at least in C/C++) to declare a function with the inner loop when nesting loops (not for loops, since when, i.e. looping ...
- 141
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votes
4
answers
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Complexity in nested loops
Foreword:
In this post, I will make the common confusion between O(n) and Theta(n) as complexity notations.
I will write pseudo-code to talk about algorithms, using whatever notation I find to my ...
- 1,339
2
votes
1
answer
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views
Proper way to refactor multiple if based conditions [duplicate]
I took over a large legacy code base. It has a code like this:
if ($route == 'login' || $route == 'logout' || $route == 'forgot-password') {
return;
}
if ($loggedInUser == false && $...
- 133