Puzzle P4

Examine the following:

#include <stdio.h>
int main( void )
{
  int  a = 99;
  int *pa ;
  int *qa ;
  
  pa  = &a ;
  
  qa  = pa ;
 
  printf("a=%d *pa=%d *qa=%d\n", a, *pa, *qa );

  return 0;
}

In this example, the variable a is an int, as previously. But now there are two variables, pa and qa that can point to an int.

The fourth statement pa = &a points pa to a.

The fifth statement qa = pa copies whatever value is in pa to qa. This is just like any assignment statement: value on the right of the = is copied into the variable on the left.

Here is where you need to keep in mind pointer variable vs. pointer value. There is a value in the variable pa . That value (which happens to be a pointer value) is copied into another variable qa ( which happens to be a pointer variable.)

What does the program write to the monitor?