为什么if块中的代码以任何方式执行？
switch(v)
{
case a:
break;
...
if(condition)
{
case f:
...
break;
case g:
...
break;
}
...
case z:
...
break;
default:
}
这个原因错误:
$xml .= "\t<team id=\"$team['id']\"";
这不会导致错误:
$xml .= "\t<team id=\"\"";
有什么问题？
<html>
<head>
<title>Page title</title>
<script language="JavaScript" type="text/javascript">
function oneClick ()
{
document.write ( "oneClick () executed." );
}
</script>
</head>
<body>
<input id = "button1" type = "button" value = "click" oneclick = "oneClick ()" />
</body>
</html>
单击按钮后没有任何反应,我认为oneClick()没有执行!
void draw_diamond(int n)
{
int mid_pos = ceil((double)n / 2);
int left_spaces = mid_pos-1;
int line_stars = 1;
putchar(10);
//printing from top through the middle of the diamond
for(line_stars, left_spaces ; line_stars <= n; line_stars+=2, left_spaces--);
{
//printing the left_spaces
for(int i=1; i<=left_spaces; i++)
putchar(32);
//printing the line_stars
for(int i=1; i<=line_stars; i++)
putchar('*');
putchar(10);
}
...
我有问题就在这里,当我step into将for loop是第一次,没有任何反应,对于第二个for loop step is applied例如:如果我pass 1 to n那么:
mid_pos = 1; left_spaces = 0; …
PHP中使用Alternative Syntax的相同控件结构的嵌套块？
以下代码段生成
syntax error, unexpected 'endforeach' (T_ENDFOREACH)
为最后一行.
<?php foreach($search_results as $book): ?>
<tr>
<td><?php echo $book['title']?></td>
<td>
<?php foreach($book["authors"] as $author)?>
<?php echo $author . ', '; ?>
<?php endforeach; ?>
</td>
</tr>
<?php endforeach; ?>
我对嵌套if结构有同样的问题,但对于不相同的嵌套块没有任何问题.