Difference between implementations of union

[hpbrothers]

please let me know why there is different outputs in the programs given below

#include<iostream.h>
union a
{
    int i;
};
a u;
void main()
{
  cout<<i;
}
 

in the above program output is 0

#include<iostream.h>
union a
{
   int i;
};
void main()
{
  a u;
   cout<<i;
}
 

in the above program output is 18125

please explain the outputs

[ilikepython]

please let me know why there is different outputs in the programs given below
code: (cpp)
#include<iostream.h>
union a
{
int i;
};
a u;
void main()
{
cout<<i;
}

in the above program output is 0

#include<iostream.h>
union a
{
int i;
};
void main()
{
a u;
cout<<i;
}

in the above program output is 18125

please explain the outputs

First, your program should be "int main()" and you should include:

#include <iostream>

instead of

#include <iostream.h>

Also, those programs don't compile. Maybe add this:

cout << u.i << endl;
 

I think that the values are garbage since you never initialize i to anything.

[swapnaoe]

Global and local initialization of i..