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Confused about stdin, stdout and stderr?
...h the console (e.g. Keyboard input).
Used in C with scanf
scanf(<formatstring>,<pointer to storage> ...);
stdout
Produces output to the console.
Used in C with printf
printf(<string>, <values to print> ...);
stderr
Produces 'error' output to the console.
Used in C wit...
error: passing xxx as 'this' argument of xxx discards qualifiers
...simple: make the functions const as:
int getId() const {
return id;
}
string getName() const {
return name;
}
This is necessary because now you can call getId() and getName() on const objects as:
void f(const StudentT & s)
{
cout << s.getId(); //now okay, but error with ...
Is it possible to set a number to NaN or infinity?
...
Cast from string using float():
>>> float('NaN')
nan
>>> float('Inf')
inf
>>> -float('Inf')
-inf
>>> float('Inf') == float('Inf')
True
>>> float('Inf') == 1
False
...
An async/await example that causes a deadlock
... context).
GetJsonAsync starts the REST request by calling HttpClient.GetStringAsync (still within the context).
GetStringAsync returns an uncompleted Task, indicating the REST request is not complete.
GetJsonAsync awaits the Task returned by GetStringAsync. The context is captured and will be...
ExecuteReader requires an open and available Connection. The connection's current state is Connectin
...Promotion(int promotionID)
{
Promotion promo = null;
var connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["MainConnStr"].ConnectionString;
using (SqlConnection connection = new SqlConnection(connectionString))
{
var queryString = "SELECT Promotio...
Better way of incrementing build number?
...about pane and other places, you can also look into setting CFBundleGetInfoString and CFBundleShortVersionString.
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What's the difference between disabled=“disabled” and readonly=“readonly” for HTML form input fields
...
@ToolmakerSteve Do you have a spec citation that empty strings are valid XHTML? I can only find commentary pages saying it's valid for HTML5. Everyone I've seen talking about XHTML say that its form for boolean attributes must be attrname="attrname". Either way, it doesn't seem t...
Possible heap pollution via varargs parameter
...e list and the compiler will not trigger any error. For example, if T is a String then the following code will compile without error but will fail at runtime:
// First, strip away the array type (arrays allow this kind of upcasting)
Object[] objectArray = bar;
// Next, insert an element with an in...
Is there a CSS selector by class prefix?
...
It's not doable with CSS2.1, but it is possible with CSS3 attribute substring-matching selectors (which are supported in IE7+):
div[class^="status-"], div[class*=" status-"]
Notice the space character in the second attribute selector. This picks up div elements whose class attribute meets eit...
Working with select using AngularJS's ng-options
...the label for <option> element. In that case you can perform certain string concatenations, in order to have more complex option labels.
Examples:
ng-options="item.ID as item.Title + ' - ' + item.ID for item in items" gives you labels like Title - ID
ng-options="item.ID as item.Title + ' ('...