assignment-operator

I am new to JAVA programming. I have read it in my book String a="Hello"; String b="Hello"; System.out.println(a==b); This should return false as a & b refer to different instances of String objects. Bcoz the assignments operator compares the instances of objects but Still I am getting a true . I am using Eclipse IDE. Example in book goes as this: String s = "s"; String sToo = "s"; System.out.println(a == b); System.out.println(s == sToo); That bit of code prints “false” for s == sToo. That's because s and sToo are references to different instances of the String object. So, even though they

I know I could do this better with std::vector , but the application I am messing with, has already a bunch of CArray parameters on a lot of related functions ... and I will not change them all at the moment! I simply want to define an empty CArray<CClass*> — array of pointers to CClass , so the problem can not be on the CClass constructor — as the default value of a function parameter. Approach 1 If I try to do it with assignment operator and default constructor : void Function(CArray<CClass*> parameter = CArray<CClass*>()); I get the error: 1>C:\Program Files (x86)\Microsoft Visual Studio 10

This question already has an answer here: Assignment associativity [duplicate] 1 answer Can anyone tell how the output became undefined ? var foo = {n: 2}; foo.x = foo = {n: 2}; console.log(foo.x); // undefined foo.x = foo = {n:2}; The foo.x refers to the property x to the object refered to by foo . However, foo = {n:2} assigns a completely new object to foo . x is indeed assigned to an object, but that object is immediately replaced by another object. The object with the x property isn’t referenced by anything anymore. You can read that line as foo.x = (foo = {n:2}); Graphical explanation var

A "Singular Iterator" is defined as an: iterators that are not associated with any sequence. A null pointer, as well as a default-constructed pointer (holding an indeterminate value) is singular My question 1 would be: Is a default constructed iterator considered a "Singular Iterator"? Secondly, I have been told here that: Results of most expressions are undefined for singular values; the only exceptions are destroying an iterator that holds a singular value, the assignment of a non-singular value to an iterator that holds a singular value, and, for iterators that satisfy the

I have a question regarding the C++ Standard. Suppose you have a base class with user defined copy constructor and assignment operator. The derived class uses the implicit one generated by the compiler. Does copying / assignment of the derived class call the user defined copy constructor / assignment operator? Or do you need to implement user defined versions that call the base class? Thank you for your help. If a derived class does not declare a copy constructor, and implicit one will be declared (12.8/4 "Copying class objects") - even if the base class has a user-delcared and defined copy

I'm pretty new to C++, and am trying to come to grips with virtual assignment. The program below consists of an abstract base class with two data members, and a derived class with one. When I set an abstract pointer to a derived object, the program uses the abstract version of operator= rather than the derived version, even though they're both declared "virtual." What am I doing wrong here? Thanks in advance, Jay #include <iostream> #include <cstring> class Abstract { protected: char * label; int rating; public: Abstract(const char * l = "null", int r = 0); virtual Abstract & operator=(const