Given the following C code:

struct department {
 char name[20];
 int id;
};

struct department d;

add a typedef to allow easy declaration of departments and add some code that uses the typedef.

What is a register variable in C? When would you use one? What is the downside of using this storage class?

What would the following C code print out?:

#include <stdio.h>

main()
{
  int i=2,j=3;
  i=j++ + i++;
  j=++j + ++i;
  printf("%d%d\n",i,j);
}

Explain what the following code does:

#include <stdio.h>

int main()
{
   int i;
   int *p;

   i = 2;
   p = &i;

   *p = 3;      

   printf("%d\n", i);

   return 0;
}

Explain the difference between pass by value and pass by reference in a C program. Write a short program that illustrates the difference.