while-loop

Can someone explain how while(foo) vs while(foo != NULL) are equivalent? Also: while(!foo) vs while(foo == NULL) I know that ! is not, but that is about all I know. Assuming foo is of pointer type, while (foo) and while (foo != NULL) are exactly equivalent. Both are also equivalent to while (foo != 0) . (In my opinion while (foo != NULL) more clearly expresses the intent.) In any context requiring a condition ( if() , while() , a few others), the expression is treated as true if the condition compares unequal to zero, false if it compares equal to zero. NULL is a macro that expands to an

I would like to write a code that would make Python scrape some data on a page, then click on the "next" button at the bottom of the page, scrape some data on the second page, click on the "next" button, etc. until the last page, where clicking on "Next" is no longer possible (because there is no "next"). I would like to make the code as general as possible and not specify beforehand the number of clicks to be done. Following this question ( How can I make Selenium click through a variable number of "next" buttons? ), I have the code below. Python does not report any error, but the program

I have a while loop, infinite, and I want to stop it when I press a keyboard key. Pseudocode: While(1) do stuff; listening for key; if key is pressed break; end end The function waitforbuttonpress makes me press the key, so no luck. I've found no option on the web. I suppose if you don't want to resort to multithreading (one thread doing the computation in the while loop, another one waiting for input and setting a global sentinel value to break the while loop) you can try to implement breaking the loop on catching a keyboard-interrupt (ctrl-c). This should be possible, albeit in a kinda

Is it possible and if so, how can I do it, to select all entries in a table in my database and then display five results at the time in one group. Meaning: A example is that I've 15 records total in my database, then I want to present my data like this: <div class="1-5">Record[1], Record[2], Record[3], Record[4], Record[5]</div> <div class="6-10">Record[6], Record[7], Record[8], Record[9], Record[10]</div> <div class="11-15">Record[11], Record[12], Record[13], Record[14], Record[15]</div> I'm not completely sure if I can do it with an SQL statement or I've to write some sort of "do...while" or

Is there any reason why I couldn't include two mysql_fetch_array statements working on two different mysql query results in one while loop? The reason is I have two query results from a mysql database each containing two columns as follows: Query 1: Date, Value 1 Query 2: Date, Value 2 Dates in each query are always week ending dates at regular intervals of 1 week ordered in ascending order. However they may start and finish at different dates for either query result. I want to build arrays to return to the calling web page of date, value 1 and value 2 only where both values 1 and 2 are

I have searched as crazy for the solution to my problem throughout the web, but none exist yet. My problem is that I have to check if I get specific text in HTTP request, which is in a while loop and if I do, then I should leave the loop and continue with the thread or stop the thread completely if text doesn't exist. I have set it up as follows: Thread Group .. While controller .. HTTP request .. Response Assertion Listener I used LAST in the while controller and set HTTP response to false text and it doesn't work. Hope the following one will work for you: Thread Group HTTP Request //set

I'm a beginner in C and trying to create a program and having a problem with my main function. Problem: After asking how many integers they'd like to enter, for example: 4 numbers, the loop goes on 5 times essentially taking in 5 numbers. It also only prints "Next: " after the 2nd number. In my while loop, which I put for error checking, after the user puts a valid method, example: enters 1, it will print out that it's an "invalid choice" and re-asks again only once more. Code: #include <stdio.h> #include<stdlib.h> #include "a3defs.h" int main() { StackType stk; StackType *stkPtr = &stk; /