The problem is that: cin >> input; Will cause the bad bit to be set when you try and read a non numeric value. After that happens any attempt to use the operator>> is silently ignored. So the way to correct for this is to test if the stream is in a good state and … Read more
You can use the second argument of iter(), to call a function repeatedly until its return value matches that argument. This would loop forever as 1 will never be equal to 0 (which is the return value of int()): for _ in iter(int, 1): pass If you wanted an infinite loop using numbers that are … Read more
for (int i = 0; i < 10; i = i++) { The above loop is essentially the same as: – for (int i = 0; i < 10; i = i) { the 3rd part of your for statement – i = i++, is evaluated as: – int oldValue = i; i = i … Read more
When you enter something that isn’t a number, scanf will fail and will leave those characters on the input. So if you enter hello, scanf will see the h, reject it as not valid for a decimal number, and leave it on the input. The next time through the loop, scanf will see the h … Read more
How about using good(?) old goto? :loop echo Ooops goto loop See also this for a more useful example.
The C# compiler will transform both for(;;) { // … } and while (true) { // … } into { :label // … goto label; } The CIL for both is the same. Most people find while(true) to be easier to read and understand. for(;;) is rather cryptic. Source: I messed a little more with … Read more
itertools provides three infinite iterators: count(start=0, step=1): 0, 1, 2, 3, 4, … cycle(p): p[0], p[1], …, p[-1], p[0], … repeat(x, times=∞): x, x, x, x, … I don’t know of any others in the standard library. Since you asked for a one-liner: __import__(“itertools”).count()
Yes, you can use a while True: loop that never breaks to run Python code continually. However, you will need to put the code you want to run continually inside the loop: #!/usr/bin/python while True: # some python code that I want # to keep on running Also, time.sleep is used to suspend the operation … Read more
The problem with asking this question is that you’ll get so many subjective answers that simply state “I prefer this…”. Instead of making such pointless statements, I’ll try to answer this question with facts and references, rather than personal opinions. Through experience, we can probably start by excluding the do-while alternatives (and the goto), as … Read more
You keep on getting new a new string and continue the loop if it’s not empty. Simply insert a control in the loop for an exit string. while(!s1.equals(“exit”) && sc.hasNext()) { // operate } If you want to declare the string inside the loop and not to do the operations in the loop body if … Read more