still i am confusing about using strncpy..

following line in ur program how its work i still didnt understand

strncpy(m_strName, strName, 25);

kind regards

An object of the class does have an address, because it is an actual variable. You can find the address by using the address-of (&) operator:

Foo cMyFoo; // declare a Foo object
cout < < &cMyFoo << endl; // print its address

Member functions also have an address, because you can set a pointer to them, and you can pass their address into a function:

int (Foo::*ptr)() = &Foo::GetValue;

ptr is a pointer to a member function of Foo that takes no parameters and returns an integer. It is being set to the address of the Foo::GetValue() function.

an object (instance of the class) is created after the ‘closing curly brackets and the semicolon’ of the class-declaration.

what is the address of the class ?
what is the address of the class-object ?
what is the address of the member-function ?

please enlighten me to keep up my tempo of persuing c++.

thanks
prabhakar.

DateStruct sToday = { 10, 14, 2014 };

#include 

struct DateStruct
{
  int nMonth;
  int nDay;
  int nYear;
};

int myInt = 5;

DateStruct sToday;
//sToday.nMonth = 10; *will cause error here
//sToday.nDay = 14;
//sToday.nYear = 2014;

void SetDate(DateStruct &sDate, int nMonth, int nDay, int nYear)
{
  sDate.nMonth = nMonth;
  sDate.nDay = nDay;
  sDate.nYear = nYear;
}

int main()
{
  using namespace std;

  DateStruct sToday;

  sToday.nMonth = 10; * works O.K. if I assign here.
  sToday.nDay = 14;
  sToday.nYear = 2014;

  SetDate(sToday, 4, 4, 2008);

  cout < < "Date values are: " << sToday.nMonth << "/" << sToday.nDay << "/" << sToday.nYear << endl;

  return(0);
}

If I comment out setting the global sToday members and use the ones in main()
it works O.K. but not vice versa. So…. you can assign a value to global variables
when they are declared but not members of a struct? (int myInt = 5;)
Unless I’m making a syntax mistake somewhere. Need grouping braces? {} ? ]]> http://www.learncpp.com/cpp-tutorial/82-classes-and-class-members/#comment-10889 Alex Fri, 04 Apr 2008 00:50:39 +0000 http://www.learncpp.com/cpp-tutorial/82-classes-and-class-members/#comment-10889 Hmm, that's an odd one. Is the code that uses sToday inside a function, or is it floating in global space? Declarations can be in global space, but code that executes instructions can not be. I would put the following code: <pre> DateStruct sToday; sToday.nMonth = 10; sToday.nDay = 14; sToday.nYear = 2014; </pre> inside your main() function and then see if it works. I suspect it will. Also, as far as the & goes, that means we're passing a DateStruct by reference instead of by value. This will allow SetDate to modify the actual sDate we pass in instead of just a copy. Hmm, that’s an odd one. Is the code that uses sToday inside a function, or is it floating in global space? Declarations can be in global space, but code that executes instructions can not be. I would put the following code:

DateStruct sToday;

  sToday.nMonth = 10;
  sToday.nDay = 14;
  sToday.nYear = 2014;

inside your main() function and then see if it works. I suspect it will.

Also, as far as the & goes, that means we’re passing a DateStruct by reference instead of by value. This will allow SetDate to modify the actual sDate we pass in instead of just a copy.

struct DateStruct
{
  int nMonth;
  int nDay;
  int nYear;
};

DateStruct sToday;

  sToday.nMonth = 10; ---- Errors here.
  sToday.nDay = 14;
  sToday.nYear = 2014;

void SetDate(DateStruct &sDate, int nMonth, int nDay, int nYear)...

The error is: “expected constructor, destructor, or type conversion before ‘.’ token.

Also, not quite sure why the & reference for the &sDate in the SetDate function?
Is this so just passing the reference instead of whole structure when calling the
function?

Thank you for your help.

p.s. Love these lessons