According to the C++ Standard 1 The && operator groups left-to-right. The operands are both contextually converted to bool (Clause 4). The result is true if both operands are true and false otherwise. Unlike &, && guarantees left-to-right evaluation: the second operand is not evaluated if the first operand is false. and 1 The || operator groups left-to-right. … Read more
This question has been discussed so often on the Ruby mailing-lists and Ruby blogs that there are now even threads on the Ruby mailing-list whose only purpose is to collect links to all the other threads on the Ruby mailing-list that discuss this issue. Here’s one: The definitive list of ||= (OR Equal) threads and pages If you really want … Read more
The C# language doesn’t have a power operator. However, the .NET Framework offers the Math.Pow method: Returns a specified number raised to the specified power. So your example would look like this:
There are several places colon is used in Java code: 1) Jump-out label (Tutorial): 2) Ternary condition (Tutorial): 3) For-each loop (Tutorial): 4) Assertion (Guide): 5) Case in switch statement (Tutorial): 6) Method references (Tutorial)
Use std::ostream and std::istream everywhere. ostream and istream are in namespace std
=~ is the operator testing a regular expression match. The expression /9eaf/ is a regular expression (the slashes // are delimiters, the 9eaf is the actual regular expression). In words, the test is saying “If the variable $tag matches the regular expression /9eaf/ …” and this match occurs if the string stored in $tag contains those characters 9eaf consecutively, in order, at any point. So this … Read more
It can have 3 distinct meanings: ‘<<‘ as an ordinary method In most cases ‘<<‘ is a method defined like the rest of them, in your case it means “add to the end of this array” (see also here). That’s in your particular case, but there are also a lot of other occasions where you’ll encounter … Read more
The =~ operator matches the regular expression against a string, and it returns either the offset of the match from the string if it is found, otherwise nil. You can place the string/regex on either side of the operator as you can see above.
In Python 3.x, 5 / 2 will return 2.5 and 5 // 2 will return 2. The former is floating point division, and the latter is floor division, sometimes also called integer division. In Python 2.2 or later in the 2.x line, there is no difference for integers unless you perform a from __future__ import division, which causes Python 2.x to adopt the 3.x behavior. … Read more
Modulus operator; gives the remainder of the left value divided by the right value. Like: 3 % 1 would equal zero (since 3 divides evenly by 1) 3 % 2 would equal 1 (since dividing 3 by 2 results in a remainder of 1).