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Undefined behavior is simply behavior that is not defined by the C++ specification. For example, if you have multiple unary increment/decrement operations in an expression like i++ + ++i, they result in behavior that is not defined. This is simply due to the fact that some language constructs are syntactically valid but you can't predict the behavior when the code is run. Another example is the expression: u = (u++);Implementation-defined behavior is behavior unspecified by the specification and left for the implementor to decide and document how the choice is made. In this case, the choice that is made must ... Read More
The ctrlKey property is used to show whether the CTRL key is pressed or not when key event was triggered. You can try to run the following code to learn how to implement a ctrlKey property in JavaScript − Example Live Demo Press any key function funcCtrlKey(event) { var val = document.getElementById("res"); if (event.ctrlKey) { val.innerHTML = "CTRL key: Pressed"; } else { val.innerHTML = "CTRL key: NOT Pressed"; } }
The hashCode(Object[]) method of the java.util.Arrays class returns a hash code based on the contents of the specified array. If the array contains other arrays of elements, the hash code is based on their identities rather than their contents. For any two arrays a and b such that Arrays.equals(a, b), it is also the case that Arrays.hashCode(a) == Arrays.hashCode(b). Example import java.util.Arrays; public class ArrayDemo { public static void main(String[] args) { Object[] ob = new Object[] { 22, 7 }; ... Read More
On client and server, the following storages are available: local storage, session storage, and cookies.The Local Storage is designed for storage that spans multiple windows and lasts beyond the current session. In particular, Web applications may wish to store megabytes of user data, such as entire user-authored documents or a user's mailbox, on the client side for performance reasons. Cookies do not handle this case well because they are transmitted with every request.Local Storage is available for every page and remains even when the web browser is closed, but you cannot read it on the server.The stored data has no ... Read More
MySQL ADDTIME() function can be used to add a time interval in the data stored in a column of the table. The syntax of this function is ADDTIME(date, ‘expression unit’). It can be demonstrated by following the example which uses the data from table ‘collegedetail’. mysql> Select estb, ADDTIME(estb, '05:04:25')AS 'Date with time' From collegedetail WHERE ID = 111; +------------+---------------------+ | estb | Date with time | +------------+---------------------+ | 2010-05-01 | 2010-05-01 05:04:25 | +------------+---------------------+ 1 row in set (0.02 sec) Here, ‘estb’ is a column of table ‘collegedetail’ having the date as values.
The left operand value is moved left by the number of bits specified by the right operand.Example: A
You can use PHP array in JavaScript. It works for a single as well as the multidimensional array. Use the json_encode() method to achieve this.The following is the Multi-dimensional PHP array.$myArr= array( array('Amit', 'amit@example.com'), array('Rahul, 'rahul@example.com'), );Converting PHP multidimensional array into JavaScript. var arr = ; Now, let’s finally learn how to access it to output the email.document.write(arr[1][1]);
The left operand value is moved right by the number of bits specified by the right operand.Example: A >> 2 = 15 means 1111.
A smart pointer is a class that wraps a 'raw' (or 'bare') C++ pointer. It is used to manage resources the pointer points to. For example, if the reference to that memory location is lost. It kind of acts like a garbage collector. There are multiple smart pointer types.You should almost always use a smart pointer. This is because the main pain point of using pointers is manual memory management and memory leaks. The smart pointer tries to get rid of both of these. If you don't want to do either of these in practice, you should use a smart ... Read More
As we know that the range of TIME field in MySQL is ‘-838:59:59’ to ‘838:59:59’. Now, if TIMEDIFF() function’s output surpasses this range then MySQL will return either ‘-838:59:59’ or ‘838:59:59’ depends upon the values of the argument. Example mysql> Select TIMEDIFF('2017-09-01 03:05:45', '2017-10-22 03:05:45')AS 'Out of Range TIME Difference'; +------------------------------+ | Out of Range TIME Difference | +------------------------------+ | -838:59:59 | +------------------------------+ 1 row in set, 1 warning (0.00 sec) mysql> Select TIMEDIFF('2017-10-22 04:05:45', '2017-09-01 03:05:45')AS 'Out of Range ... Read More