Reason for the output of the following C++ program?

Question

include <iostream.h>

class myClass

{

public:

int x;

myClass()

{

x++;

}

};

main()

{

myClass obj1,obj2;

cout<<obj1.x<<"\t"<<obj2.x;

system("pause");

}

Why am i getting this output:

3 67

Answer 1

The display is from  the line:

         cout&lt;&lt;obj1.x&lt;&lt;&quot;\t&quot;&lt;&lt;obj2.x;

which prints the value of the int x from both objects. Since you haven&#039;t initialised x to any particular value, it&#039;ll print the value of the memory location that x occupied, whatever that is.

Try this:

class myClass

{

public:

   int x = 0;

   myClass(int j)

   {

      x = ++j;

   }

};

main()

{

   myClass obj1,obj2(10);

   cout&lt;&lt;obj1.x&lt;&lt;&quot;\t&quot;&lt;&lt;obj2.x;

   system(&quot;pause&quot;);

}

Answer 2

You never initiate the variable in myClass. You need set a value to x, after the obj1 and obj2 defined. Currently, the value is what in memory like a garbage.

obj1.x = 1;

obj2.x = 2;

cout&lt;&lt;obj1.x&lt;&lt;&quot;\t&quot;&lt;&lt;obj2.x;

Good luck,

peng

http://www.eptop.com

Answer 3

include &lt;iostream.h&gt;

class myClass

{

public:

int x, j;

myClass()

{

j=1 ;

x=++j ;

}

};

main()

{

myClass obj1,obj2;

cout&lt;&lt;obj1.x&lt;&lt;&quot;\t&quot;&lt;&lt;obj2.x;

system(&quot;pause&quot;);

}