problem about equals-operator-Collection of common programming errors

• 
  Jon Seigel
  .net operators override equals-operator
  Or it’s advisable to do that? Why?
• 
  Groo
  c# string equals equals-operator
  What is the difference between == and Equals() with example? I know that == is used to compare operator and Equals() method is used to compare content of string.So i tried// first example string s1 = “a”; string s2 = “a”; Console.Write(a.Equals(s2)); // returns true, but if I assign “b” to s2,// then result will be false// second example string s1 =”a”; string s2 =”a”; Console.Write(s1 == s2); // returns trueHow this is so? Both are different object references. Suppose we consider that these
• 
  Jon Seigel
  c# operators type-conversion equals-operator
  Some code for context: class a {}class b {public a a{get;set;}public static implicit operator a(b b){return b.a;} }a a=null;b b=null;a = b;//compiler: cannot apply operator ‘==’ to operands of type tralala…bool c = a == b;Is it possible to use == operator on different type instances, where one can implicitly convert to another? What did i miss? Edit: If types must be the same calling ==, then why int a=1; double b=1; bool c=a==b;works?
• 
  Jon Seigel
  c++ operators polymorphism virtual equals-operator
  Can someone please put me out of my misery with this? I’m trying to figure out why a derived operator== never gets called in a loop. To simplify the example, here’s my Base and Derived class:class Base { // … snippedbool operator==( const Base& other ) const { return name_ == other.name_; } };class Derived : public Base { // … snippedbool operator==( const Derived& other ) const { return ( static_cast<const Base&>( *this ) ==static_cast<const Base&>( other ) ? age
• 
  Martin
  c# java operators equals-operator
  in c# what does exactly happen in the background when you do a comparison with the “==” operator on two objects? does it just compare the addresses? or does it something like Equals() or CompareTo() ?PS: what about the “==” operator in java? does it behave the same?
• 
  phoog
  c# operator-overloading equals-operator
  With code like the followingpublic class Task {string Name;public static bool operator ==(Task t1, Task t2){ return t1.Name = t2.Name && t1.GetType() == t2.GetType(); } } public class TaskA : Task {int aThing;public static bool operator ==(TaskA t1, TaskA t2){ return (Task)t1 == (Task)t2 && t1.GetType() == t2.GetType()&& t1.aThing == t2.aThing; } } public class TaskB : Task //more of the sameclass Stuffin {List<Task> Tasks;void CheckIt(){bool theSame = Tasks[0] ==
• 
  cellige
  mysql null operators equals equals-operator
  MySql provides a nice operator <=> that works with comparisons that could contain a null such as null <=> null or null <=> 5 etc giving back intuitive results as many programming languages. Where as the normal equals operator always just returns null, which catches many new MySql users such as myself awry.Is there a reason MySql has both and not JUST the functionality in <=> ? Who really needs an operator that is effectively undefined with built in language types?
• 
  Exception
  javascript equals-operator identity-operator
  Possible Duplicate:Javascript === vs == : Does it matter which “equal” operator I use?When would JavaScript == make more sense than ===? What is the difference between below methods in comparing a string with undefined value. var x; if(x==undefined) { alert(x); }and if(x===undefined) { alert(x); }Why should i prefer second method in this case.. Please let me know advantages..

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