Trace: 
What is the output of the following program?

char a = 'A';
char *p = &a;


void
fun1 (char b)
{
  b = 'b';
  printf("%c %c %c\n", a, b, *p);
}

void
fun2 (char *p1)
{
  char a = 'x';
  *p = 'b';
  *p1 = 'P';
  printf("%c %c %c\n", a, *p1, *p);
}

void
fun3(char b1, char *b2)
{
  b1 = a;
  p = b2;
  printf("%c %c %c\n", a, b1, *p);
}

int
main ()
{
  char b = 'B';
  printf("%c %c %c\n", a, b, *p);
  fun1(b);
  printf("%c %c %c\n", a, b, *p);
  fun2(&b);
  printf("%c %c %c\n", a, b, *p);
  fun3(b, &b);
  printf("%c %c %c\n", a, b, *p);
  b = 'r';
  a = 'j';
  *p = 't';
  printf("%c %c %c\n", a, b, *p);
  return(0);
}