hello friends,

i want to pass an object as an argument as follows.

#include <iomanip>
#include <iostream>
using namespace std;

class myclass
{
public :
int m,n;

myclass(){m=10;n=12;}
};

ostream & disp( ostream & output,myclass &obj)
{
output<<"Hello"<<endl;
output<<obj.m;
return output;
}

void main()
{
myclass myobjct;
cout<<disp<<myobjct;
}


Above code does not run.
How to achieve above feature ?

plase help me. its urgent.
thank you.

: hello friends,
:
: i want to pass an object as an argument as follows.
:
: #include <iomanip>
: #include <iostream>
: using namespace std;
:
: class myclass
: {
: public :
: int m,n;
:
: //myclass(){m=10;n=12;} // this not error

myclass() : m(10), n(12) {} // but this better

: };
:
: ostream & disp( ostream & output,myclass &obj)
: {
: output<<"Hello"<<endl;
: output<<obj.m;
: return output;
: }
:
: void main()
: {
: myclass myobjct;
: //cout<<disp<<myobjct;

cout << disp(cout, myobjct);

: }
:
:
: Above code does not run.
: How to achieve above feature ?
:
: plase help me. its urgent.
: thank you.
:

hi,

i tried to pass the object the way you specified but
at the end of the output, it gives some garbage value.

here is the code that i executed.

#include <iomanip>
#include <iostream>
using namespace std;

class myclass
{
public :
int m,n;

myclass(){m=10;n=12;}
};

ostream & disp( ostream & output,myclass &obj)
{
output<<"m="<<obj.m<<endl;
output<<"n="<<obj.n<<endl;
return output;
}

void main()
{
myclass myobjct;
//cout<<disp<<myobjct;
cout<<disp(cout, myobjct)<<endl;
}


here is the output :
m=10
n=12
004777E4 // this is the garbage value
Press any key to continue

What is the problem ?

: hi,
:
: i tried to pass the object the way you specified but
: at the end of the output, it gives some garbage value.
:
: here is the code that i executed.
:
: #include <iomanip>
: #include <iostream>
: using namespace std;
:
: class myclass
: {
: public :
: int m,n;
:
: myclass(){m=10;n=12;}
: };
:
: ostream & disp( ostream & output,myclass &obj)
: {
: output<<"m="<<obj.m<<endl;
: output<<"n="<<obj.n<<endl;
: return output;
: }
:
: void main()
: {
: myclass myobjct;
: //cout<<disp<<myobjct;
: cout<<disp(cout, myobjct)<<endl;
: }
:
:
: here is the output :
: m=10
: n=12
: 004777E4 // this is the garbage value
: Press any key to continue
:
: What is the problem ?
:

the function disp() is showing the values of obj.m and obj.n. this function also returned an ostream type object by reference. ur line of code

cout<<disp(cout, myobjct)<<endl; [/black]

is showing the ostream object cout (since it is returning by ur disp() function). this is not the garbage value. also not a meaningful one in this case.

probably u were wanting an operator function to display the object directly via cout <<. then u should have the following function instead of disp():

ostream & operator <<( ostream & output, const myclass &obj) 
{ 
 output<<"m="<<obj.m<<endl; 
 output<<"n="<<obj.n<<endl; 
 return output; 
}

look i have made the obj constant inside the operator function. it is always a good idea to pass a constant reference in a function when the object should not change its value inside that function.

---

~Donotalo()