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How do I give text or an image a transparent background using CSS?
...
<p style="background-color: rgba(255, 0, 0, 0.5);">
<span>Hello, World!</span>
</p>
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Understanding checked vs unchecked exceptions in Java
...h might result in a RuntimeException. For ex:
try {
setStatusMessage("Hello Mr. " + userObject.getName() + ", Welcome to my site!);
} catch (NullPointerException npe) {
sendError("Sorry, your userObject was null. Please contact customer care.");
}
This is a bad programming practice. Instea...
MongoDB/NoSQL: Keeping Document Change History
...
{
_id: "4c6b9456f61f000000007ba6"
title: [
{ version: 1, value: "Hello world" },
{ version: 6, value: "Foo" }
],
body: [
{ version: 1, value: "Is this thing on?" },
{ version: 2, value: "What should I write?" },
{ version: 6, value: "This is the new body" }
],
tags:...
Vertical (rotated) text in HTML table
...ntext.Response.ContentType = "text/plain"
'context.Response.Write("Hello World!")
context.Response.ContentType = "image/png"
Dim strText As String = context.Request.QueryString("text")
Dim strRotate As String = context.Request.QueryString("rotate")
Dim strBGc...
How do I pass a variable by reference?
... a swap function that can swap two references, like this: a = [42] ; b = 'Hello'; swap(a, b) # Now a is 'Hello', b is [42]
– cayhorstmann
Dec 20 '12 at 3:42
...
Undefined, unspecified and implementation-defined behavior
... a classic example:
#include <iostream>
int main()
{
char* p = "hello!\n"; // yes I know, deprecated conversion
p[0] = 'y';
p[5] = 'w';
std::cout << p;
}
The variable p points to the string literal "hello!\n", and the two assignments below try to modify that string li...
Templated check for the existence of a class member function?
...certain method. Here's the working code:
#include <iostream>
struct Hello
{
int helloworld() { return 0; }
};
struct Generic {};
// SFINAE test
template <typename T>
class has_helloworld
{
typedef char one;
struct two { char x[2]; };
template <typename C> st...
Makefile经典教程（入门必备） - C/C++ - 清泛网 - 专注IT技能提升
...”的第一个方式，来看一个例子：
x = $(y)
y = z
z = Hello
a := $($(x))
这里的$($(x))被替换成了$($(y))，因为$(y)值是“z”，所以，最终结果是：a:=$(z)，也就是“Hello”。
再复杂一点，我们再加上函数：
x = variable1
variabl...
Makefile经典教程（入门必备） - C/C++ - 清泛网 - 专注IT技能提升
...”的第一个方式，来看一个例子：
x = $(y)
y = z
z = Hello
a := $($(x))
这里的$($(x))被替换成了$($(y))，因为$(y)值是“z”，所以，最终结果是：a:=$(z)，也就是“Hello”。
再复杂一点，我们再加上函数：
x = variable1
variabl...
Makefile经典教程（入门必备） - C/C++ - 清泛网 - 专注IT技能提升
...”的第一个方式，来看一个例子：
x = $(y)
y = z
z = Hello
a := $($(x))
这里的$($(x))被替换成了$($(y))，因为$(y)值是“z”，所以，最终结果是：a:=$(z)，也就是“Hello”。
再复杂一点，我们再加上函数：
x = variable1
variabl...