??can u check this program...

[Shana]

#include<iostre am.h>
class Room
{
int length;
int width;

public:
Room()
{}
Room(int l,int w=0) : width(w),length (l)
{
}
};

void main()
{
Room objRoom1;
Room obj2Room2(12,8) ;
}

This program is not giving any error.Now my question is : wat is the signifcance of this type of constructor declaration Room(int l,int w): width(w),legth( l)

y data member is defined as a function declaration and w and l as argument?
Note that commenting :width(w),lengt h(l) does not give error while declaring width= w, length = l is giving error.

CAN ANYONE PLZZZ EXPLAIN THIS TO ME........

[arne]

#include<iostre am.h>
class Room
{
int length;
int width;

public:
Room()
{}
Room(int l,int w=0) : width(w),length (l)
{
}
};

void main()
{
Room objRoom1;
Room obj2Room2(12,8) ;
}

This program is not giving any error.Now my question is : wat is the signifcance of this type of constructor declaration Room(int l,int w): width(w),legth( l)

y data member is defined as a function declaration and w and l as argument?
Note that commenting :width(w),lengt h(l) does not give error while declaring width= w, length = l is giving error.

CAN ANYONE PLZZZ EXPLAIN THIS TO ME........

The part in bold letters in your post is called a "constructo r initializer list". It is a sequence of statements that tell the compiler to initialize the corresponding members with the values in brackets. It is 'better' (more efficient) than

Room(int l,int w=0) {
        length = l;
        width = w;
}

since the members are always initialized and only changed in the constructor's body. The net effect, of course, is the same.

[Shana]

cooll...... I hav never come across this kinda of constructor declaration.
Thanks...!!