Hi,
I have a small query. why we need to return reference in prefix operator
overloading. Because, when we call as ++obj , the operator ++ method will be
called and we increment the values using this pointer. I will paste the code.
Please let me know where I failed.
#include<stdio.h>
#include<conio.h>
#include<iostream>
using namespace std;
class mydata
{
private:
int x,y;
public:
mydata()
{
cout<<"I m i9n cons"<<endl;
}
mydata(int a,int b):x(a),y(b)
{
cout<<"I m in parm"<<endl;
}
void sow()
{
cout<<"x = "<<x<<" y = "<<y<<endl;
}
mydata & operator +(mydata &obj)
{
x=x+obj.x;
y=y+obj.y;
return *this;
}
void operator ++()
{
this->x++;
this->y++;
}
friend mydata& operator +(int val,mydata &obj)
{
obj.x=val+obj.x;
obj.y=val+obj.y;
return obj;
}
mydata(mydata &obj)
{
this->x=obj.x;
this->y=obj.y;
}
mydata & operator =(mydata &obj)
{
if(this!=&obj)
{
this->x=obj.x;
this->y=obj.y;
}
return *this;
}
};
void main()
{
mydata obj1(2,4);
obj1.sow();
mydata obj2(4,7);
obj2.sow();
obj1=obj1+obj2;
obj1.sow();
#ifdef _DEBUG
__asm{int 3}
#endif
++obj1;
obj1.sow();
mydata obj3=2+obj1;
obj3.sow();
}
GopiKrishna Komanduri
Software engineer
[EMAIL PROTECTED]
--- On Thu, 27/11/08, Gopi Krishna Komanduri <[EMAIL PROTECTED]> wrote:
From: Gopi Krishna Komanduri <[EMAIL PROTECTED]>
Subject: [c-prog] query on Exception handling (in constructor and desctructor)
To: [email protected]
Date: Thursday, 27 November, 2008, 10:24 AM
Hi,
I have a query related to exceptional handling. I pasted the code I tried
following this mail.
My intention is , what happens in a sistuation when any exception is caught in
main , so while destructing the objects till that instant again if any
exception is caught (stack unwinding concept).
similary in constructor. For constructor I know that the desctructors of the
sub objects will be called . But how that exception is handled .
#include<stdio. h>
#include<conio. h>
#include<iostream>
using namespace std;
class var1
{
public:
var1()
{
cout<<"I m in var1 conc"<<endl;
}
~var1()
{
cout<<"I m in var1 desc"<<endl;
}
};
class MyCls
{
public:
var1 *obj;
MyCls():obj( NULL)
{
obj=new var1();
cout<<"I m in cons"<<endl;
}
~MyCls()
{
cout<<"I m in desc"<<endl;
throw "excepto";
delete obj;
cout<<"Deleted obj"<<endl;
}
};
void main()
{
try
{
MyCls obj;
cout<<"Obj Created"<<endl;
throw "error";
cout<<"Obj after throwing err"<<endl;
}
catch(char *x)
{
cout<<x<<endl;
}
catch(...)
{
cout<<"I m in last"<<endl;
}
}
GopiKrishna Komanduri
Software engineer
Hyderabadgopikomand [EMAIL PROTECTED] com
--- On Tue, 25/11/08, Brett McCoy <[EMAIL PROTECTED] com> wrote:
From: Brett McCoy <[EMAIL PROTECTED] com>
Subject: Re: [c-prog] Exception handling
To: [EMAIL PROTECTED] com
Date: Tuesday, 25 November, 2008, 9:29 PM
On Tue, Nov 25, 2008 at 9:10 AM, crystalcat_75
<crystalcat_ 75@ yahoo.co. in> wrote:
> Following program is showing an error while running in turbo c :
> undefined symbol for "try"
> statement missing after try .
I don't think Turbo C supports exceptions. You need to upgrade to a
modern compiler like Dev-C++ or MS Visual C++ Express (they are free)
and not use something that is 15+ years old.
-- Brett
------------ --------- --------- --------- --------- --------- -
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