if-statement

问题 I am trying to get this if statement to follow as: if the first string position is .png, then get $png1 from a haystack, but if the first string position is .jpg, then get $jpg1 from the haystack, but if it is .gif, get $gif1 from haystack, else if none of them are found then the string position is .bmp so get $bmp1 Here is what i tried, but it doesn't parse correctly: <?php // if first occurence is .png get $png1 needle from haystack if (preg_match('#cid:([^"@]*).png@([^"]*)#', $html_part))

问题 I try to write my first trigger for a MySQL Database. It should prevent an insert (and later also updates) on " course_student " in context of the current time and the given timestamps in " capacity ", but i'm still getting a syntax error. DELIMITER $$ CREATE TRIGGER checkSubscribeTimeCourse BEFORE INSERT ON course_student REFERENCING NEW AS new FOR EACH ROW BEGIN IF (SELECT COUNT(*) FROM capacity c, course_capacity cc WHERE c.cid = cc.cid AND cc.cid = new.cid AND (c.end >= CURRENT_TIMESTAMP

问题 I have an if-else if construct which gives me grades A, B, C, D, F depending on marks from 0-100. if (mark > 100) | (mark < 0) disp('Invalid mark'); return; % Exit from the program. end % Of first if statement if mark >= 80 % Mark is in range 80 - 100. grade = 'A'; elseif mark >= 70 % Mark is in range 70 - 79. grade = 'B'; elseif mark >= 60 % Mark is in range 60 - 69. grade = 'C'; elseif mark >= 50 % Mark is in range 50 - 59. grade = 'D' else % Mark is in range 0 - 44. grade = 'F'; end disp

问题 I want to check if the screen width is higher than 1024 pixels, to set sidebar + 50px I tried this piece of code (but the sidebar doesnt load on 1024+): <?php $arjunaOptions = arjuna_get_options(); ?> <?php //calculate sidebar and content area ratio if ($arjunaOptions['sidebarDisplay'] != 'none') { $available = 920; $available2 = 970; $contentArea = $arjunaOptions['contentAreaWidth']; $sidebar = $available - $contentArea; $sidebarlarge = $available2 - $contentArea ; $sidebarLeftRight = floor(

问题 I have a situation where I need to apply several "value boundaries" to several different "starting positions" and then subsequently output the "ongoing position". The "value boundaries" are: <500, >=500<750, >750<=850 and >850 The "starting positions" are "Basic", "Standard", "Standard+", and "Platinum", The value boundaries are then applied and the "ongoing position" outputted, e.g. a person starting at "Basic" achieves 600 and then moves to "standard", or someone at "Platinum" gets 700 so

问题 I have created a form with several user inputs but have the tedious task of checking whether each individual input is not empty before submission. Is there a quicker way, (such as using arrays perhaps) of listing all arguments to the if statement? At the moment my code looks like this but if possible I would like it to be more efficient in future, like if I were to add more inputs. <form action="sign-up.php" method="post" autocomplete="off" > Name:<input type="text" name="name" /> Username:<

问题 I have this batch script that has numerous "if statements". Here are a couple lines of what I have: if %c%==PC exit if %c%==pc exit if %c%==CMD exit if %c%==cmd exit if %c%==MENU exit if %c%==menu exit if %c%==KILL exit if %c%==kill exit There are many more possibilities and really could use some simplifying if it is possible. So is there a way I can simplify this? Perhaps something like, if the variable c is equal to any of these exit. Or even make the if statements case insenstitive Is this

问题 I am developing game, Initially I was using boolean while decalring arrays, latter it revealed that instead of using boolean I should use int in order to store state of game, When I replaced boolean with int my if statement shows type mismatch exception and The operator && is undefined for the argument type(s) boolean, int . Here is my if statement code. int [][] dots protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawPaint(pBack); for (int y = 0; y < numRows; y++) {

问题 i need to display a scrollview in react native application, after a condition using if. In fact, i have a list of items in firebase that contain text and title but sometimes they may contain images also. I need to display that list of text and titles in the exact same order and also the images if there is any. here the code i used _renderScrollViewContent() { const data = this.state.items if (data.image) { return ( <View> {data.map((item, i) => <View key={i}> <Image source={require('path')}/>

问题 I am creating a simple search program that searches for my name block of text. The issue I am having is at the end, when I place the letters in the array, they seem to come out a single character on each line, rather than uniformly in one single block of text. Can anyone point out the discrepancy? var text = "hah hah Aaron hah hah Aaron\ hah hah hah hah hoh Aaron hah hah hah hah\ Aaron Aaron Aaron hah"; var myName = "Aaron"; var hits = []; for (var i =0; i< text.length; i++) { if (text[i] ===