If you want to study termination properties in depth, programs using successor-arithmetics are an ideal study object: You know a priori what they should describe, so you can concentrate on the more technical details. You will need to understand several notions. Universal termination The easiest way to explain it, is to consider Goal, false. This … Read more
C11 clarifies the answer to this question, in the draft C11 standard section 6.8.5 Iteration statements added the following paragraph: An iteration statement whose controlling expression is not a constant expression,156) that performs no input/output operations, does not access volatile objects, and performs no synchronization or atomic operations in its body, controlling expression, or (in … Read more
This is how basic_istream works. In your case when cin >> num1 gets wrong input – failbit is set and cin is not cleared. So next time it will be the same wrong input. To handle this correctly you can add check for correct input and clear&ignore cin in case of wrong input. For example: … Read more
It’s not faster. If you really care, compile with assembler output for your platform and look to see. It doesn’t matter. This never matters. Write your infinite loops however you like.
The problem is that “scanf()” can leave unread data in your input buffer. Hence the “infinite loop”. Another issue is that you should validate the return value from scanf(). If you expect one integer value … and scanf returns “0” items read … then you know something went wrong. Here is an example: #include <stdio.h> … Read more
Well you always will have an infinite loop, but I know what you really want to know is why cin doesn’t keep prompting for input on each loop iteration causing your infinite loop to freerun. The reason is because cin fails in the situation you describe and won’t read any more input into those variables. … Read more
As per the javadoc for Scanner: When a scanner throws an InputMismatchException, the scanner will not pass the token that caused the exception, so that it may be retrieved or skipped via some other method. That means that if the next token is not an int, it throws the InputMismatchException, but the token stays there. … Read more
An infinite while loop will block the main thread wich is equivalent to a crash. You could use a selfcalling function ( wich leaves the main thread doing some other stuff inbetween): (function main(counter){ console.log(counter); setTimeout(main,0,counter+1); })(0); You can put a loop that goes from 0 to 100, and one that goes from 100 to … Read more