Interview Questions Answers.ORG
Interviewer And Interviewee Guide
Interviews
Quizzes
Home
Quizzes
Interviews Coding/Programming Interviews:Active Template Library (ATL)ActiveXApplication DeveloperArtificial intelligenceAssemblyAssociate Software EngineerAWKAWTC ProgrammingC++ ProgrammingCGI PerlCGI ProgrammingCMMICobolCritical ReasoningData Structures TreesDCOM COMDelphiDTDE4XExtensible Stylesheet Language (XSL)FortranFull-Stack DeveloperHaskellHTML DOMILUIPhone DeveloperJasper Reports DeveloperJava DeveloperLisp ProgrammingLotus NotesMicrosoft Foundation Class (MFC)Mobile DeveloperMVC DeveloperNode.jsOOPPascalPerl ProgrammingPHPPHP DeveloperProgrammingProgramming AlgorithmsProgramming ConceptsPythonRubyRuby on RailsRuby on Rails DeveloperSenior Front End DeveloperSenior Software DeveloperSignature ProgramSOASocket ProgrammingSoftware Development EngineerSoftware engineeringSr. PHP ProgrammerStack And QueueSTLSwift DeveloperTCL (Tool Command Language)Team Leader Android DeveloperUMLUnity 2D Games DeveloperUnity 3D DeveloperUnity DeveloperVBA (Visual Basic for Applications)Visual Basic (VB)Visual C++Web DevelopmentWin32APIWindows ProgramingWordPress DevelopmentWSDLXFormsXHTMLXLinkXMLXPathXQueryXSL-FOXSLT
Copyright © 2018. All Rights Reserved
Programming Interview Question:
What is a dangling pointer in programming?
Submitted by: AdministratorA dangling pointer arises when you use the address of an object after
its lifetime is over. This may occur in situations like returning
addresses of the automatic variables from a function or using the
address of the memory block after it is freed. The following
code snippet shows this:
class Sample
{
public:
int *ptr;
Sample(int i)
{
ptr = new int(i);
}
~Sample()
{
delete ptr;
}
void PrintVal()
{
cout << "The value is " << *ptr;
}
};
void SomeFunc(Sample x)
{
cout << "Say i am in someFunc " << endl;
}
int main()
{
Sample s1 = 10;
SomeFunc(s1);
s1.PrintVal();
}In the above example when PrintVal() function is
called it is called by the pointer that has been freed by the
destructor in SomeFunc.
Submitted by: Administrator
its lifetime is over. This may occur in situations like returning
addresses of the automatic variables from a function or using the
address of the memory block after it is freed. The following
code snippet shows this:
class Sample
{
public:
int *ptr;
Sample(int i)
{
ptr = new int(i);
}
~Sample()
{
delete ptr;
}
void PrintVal()
{
cout << "The value is " << *ptr;
}
};
void SomeFunc(Sample x)
{
cout << "Say i am in someFunc " << endl;
}
int main()
{
Sample s1 = 10;
SomeFunc(s1);
s1.PrintVal();
}In the above example when PrintVal() function is
called it is called by the pointer that has been freed by the
destructor in SomeFunc.
Submitted by: Administrator
Copyright 2007-2024 by Interview Questions Answers .ORG All Rights Reserved.
https://InterviewQuestionsAnswers.ORG.
https://InterviewQuestionsAnswers.ORG.