What is wrong in the following code?

public class C $\{$

private int p;

$3$

public C$()\{$

System.out.println$("$C$\text{'}$s no$-$arg constructor invoked"$)$;

this$(0)$;

$7\}$

$8$

public C$($int p$)\{$

p $=$ p;

$11\}$

$12$

public void setP$($int p$)\{$

p $=$ p;

$15\}$

$16\}$