Why not to use void main

In college, while using turbo c, we learn to use "void main()". But this is against c++ standard. Actually this shouldn't compile. Main function must return a int value. Main function should be declared like "Int main()". And at the end "return 0" may be added to indicate that function executed successfully. It may return 1 in order to indicate that some error has occurred. This is also referred as Exit Status. It can be EXIT_SUCCESS (traditionally 0) and EXIT_FAILURE. If return is not provided by programmer, it will return 0 by default.  For other exit statuses you may have a look in stdlib.h(cstdlib).

Assignment operator in RVALUE

I came across a line of code which looked a bit strange to me. It reads like this..
x= m * (n=7);
The above code is actually equivalent to
n=7
x=m*n
Actually c++ supports using assignments on the right hand side of assignments operator. And we are all familiar with that. I bet you must have seen assignments like this…
a=b=c;
This and the previous code follows the same rule.

Calling constructor from constructor

I was trying a few whiteboard programs, just for fun. In one of them I called a constructor from within another constructor. Code compiled without any fuss,but code didn’t worked the way I was expecting.  I found out that when calling a constructor from within a constructor a temporary unnamed constructor is created. That is the reason why program is not behaving the way I was expecting. Check out this…



using namespace std;

class foo
{
int x;
public:
foo()
{
x=20;
}

foo(int d)
{
x=d;
foo();//value should be changed to 20, but it wont
}
void show()
{
foo a;
a.show();// will print 20
foo b(10);
b.show();// will print 10. I was expecting it to print 20
return 0;
}

(This one is from my old blog.)

#{Header}

Hi,
    It's late night in 4th feb. I was wasting time re inventing wheels , i mean i was working on some basic c++ codes. I have practiced them a number of times, but at present i couldn't remember them. I think it's time to make a note of all these. So I am creating this blog for myself. I will post all cpp related stuffs which i feel necessary for me. If you find this site useful, please get in touch. I would love to see you as a contributer.

Regards
Rwik