11.
What will be output after executing following code?
#include
# define a 10
void main()
{
    printf("%d..", a);
    foo();
    printf("%d", a);
}
void foo()
{
   #undef a
   #define a 50
}

12.
The output of the following program is:
#define f(g,g2) g##g2
void main()
{
   int var12=100;
   printf("%d", f(var,12));
}

13.
Find the output of the following program.
#define INC(X) X++
void main()
{
   int x=4;
   printf("%d", INC(x++));
}