An "infinite loop" is a loop in which the exit criteria are never satisfied; such a loop would perform a potentially infinite number of iterations of the loop body. The general problem of determining whether the execution of a loop with given preconditions will result in an infinite loop is undecidable; in other words, there is no algorithm to determine whether an execution of a loop will eventually terminate. This is known as the halting problem.
Questions tagged [infinite-loop]
3528 questions
24
votes
1 answer
Infinite 100% CPU usage at java.io.FileInputStream.readBytes(Native Method)
I'm right now debugging a program which has two threads per one external process, and those two threads keep on reading Process.getErrorStream() and Process.getInputStream() using a while ((i = in.read(buf, 0, buf.length)) >= 0) loop.
Sometimes when…
Esko Luontola
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23
votes
3 answers
how to declare i and j to make it be an infinite loop?
while( i <= j && i >= j && i != j) {}
how to declare i and j to make it be an infinite loop ?
// it's an interview question I met.
it's asking what's the declarations of i and j, make it be always true.
And I cant make it out by declaring i and j…
Alan
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23
votes
4 answers
Creating an infinite loop
I'm trying to create an infinite loop, where a block of code will be executed forever.
All loop documentation I have found warns against creating an infinite loop, but no examples of a working one.
If I have a block of code:
{ puts "foo"
puts…
Andrew Walz
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23
votes
4 answers
Java: break statement in "if else"
I keep getting an error, if without else.
I tried else if as well
for (;;) {
System.out.println("---> Your choice: ");
choice = input.nextInt();
if (choice==1)
playGame();
if (choice==2)
loadGame();
if…
John
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23
votes
9 answers
How to get out of while loop in java with Scanner method "hasNext" as condition?
I ran into an issue. Below is my code, which asks user for input and prints out what the user inputs one word at a time.
The problem is that the program never ends, and from my limited understanding, it seem to get stuck inside the while loop. Could…
davidx1
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22
votes
2 answers
Is infinite loop still undefined behavior in C++ if it calls shared library?
It's said that infinite loop for(;;); is undefined behavior.
From http://en.cppreference.com/w/cpp/language/memory_model
In a valid C++ program, every thread eventually does one of the
following:
terminate
makes a call to an I/O library…
cshu
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- 28
- 44
21
votes
1 answer
Python - A keyboard command to stop infinite loop?
Possible Duplicate:
Why can't I handle a KeyboardInterrupt in python?
I was playing around with some Python code and created an infinite loop:
y = 0
x = -4
itersLeft = x
while(itersLeft<0):
y = y + x
itersLeft = itersLeft - 1
print…
PhillipKregg
- 9,358
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- 49
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21
votes
5 answers
Post increment operator not incrementing in for loop
I'm doing some research about Java and find this very confusing:
for (int i = 0; i < 10; i = i++) {
System.err.print("hoo... ");
}
This is never ending loop!
Anybody has good explanation why such thing happens?
Michał Kupisiński
- 3,765
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19
votes
4 answers
'while' statement cannot complete without throwing an exception - Android
With this method I'm updating TextView every second.
private void UpdatingTime(final String endTime, final long diffInDays) {
new Thread(new Runnable() {
@Override
public void run() {
…
KiKo
- 1,668
- 7
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- 56
18
votes
1 answer
Continue debugging in GHC after interrupt
I have a nonterminating expression in Haskell. I want to debug and inspect the reason why it is not terminating. A technique I learned is to use the following in GHCi:
:set -fbreak-on-exception
:trace nonterminating_expression
^C
:hist 50
So I can…
Boldizsár Németh
- 1,847
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17
votes
5 answers
Stopping an infinite loop on a remote server PHP
I have a simple infinite for loop looking like this:
set_time_limit (0);
for (;;)
{
... //Doing some stuff including to write to a file
sleep(300);
}
It's running on my server. (Shared hosting account)
How on earth can I stop it?
Pangolin
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17
votes
1 answer
Asyncio, await and infinite loops
async def start(channel):
while True:
m = await client.send_message(channel, "Generating... ")
generator.makeFile()
with open('tmp.png', 'rb') as f:
await client.send_file(channel, f)
await…
user8245289
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- 1
- 1
- 7
17
votes
5 answers
Running a BackgroundWorker continuously
I need to be able to continuously run my BackgroundWorker. The DoWork event contains a pool threaded process and the OnComplete updates my UI.
I have not been able to find a way to infinitely loop the BackgroundWorker.RunWorkerAsync() method without…
user2952817
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16
votes
3 answers
NodeJS memory consumption in an infinite loop
I don't know if this is a bug with Node or V8, but if I run the following code the node process leaks memory. The GC never seems to kick in and in a few seconds it's consuming >1GB of memory. This is unexpected behavior. Am I missing…
Matty
- 33,203
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16
votes
3 answers
For loop with no parameters in Java
I am looking at somebody else's code and I found this piece of code:
for (;;) {
I'm not a Java expert; what is this line of code doing?
At first, I thought it would be creating an infinite loop, but in the very SAME class this programmer uses…
Doug Molineux
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