+1 to sagar.
@vartika: if you don't know the concept of Union then understanding this 
program will be quite lenghty, because it will involve lot of calculation. 
try to check some simple examples, like:

union a
{
int a;
char c;
};
int main()
{
     union a xy;
     xy.a=65;
     printf("%c",xy.c);
     xy.c=65;
     printf(" %d",xy.a);
return 0;
}

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