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Write now a function static Signal xorSignals(Signal s1, Signal s2) .
SOLUTION:
Program 11.7 The various functions acting on Signal objects
public class WorkingSignals
{
public static Signal invert (Signal s) {
return new Signal (! s . initialValue , s . transitions ) ;
}
public static boolean valueAt( Signal s , int time)
{
boolean v = s. initialValue ;
Transition t = s. transitions ;
while (t != null ) {
if (time < t . time)
return v;
v= !v;
t=t.next;
return v;
}
{
public static void print(Signal s)
boolean v = s. initialValue ;
Transition t = s. transitions ;
System . out . print ( "-inf -> " );
while (t != null )
{
System . out . println ( t . time + ":" +v);
System . out . print ( t . time + "->" );
v= !v;
t=t.next;
System . out . println ( "+inf : " +v);
}
public static Transition shift (Transition t ,
int delta) {
if (t == null )
return null ;
else
return new Transition(t . time + delta ,
shift(t.next , delta));
}
public static Signal shift (Signal s , int delta)
{
return new Signal(s . initialValue ,
shift(s. transitions , delta));
}
{
public static boolean isWellFormed ( Transition t )
||
if (t == null
t.next == null )
return true ;
 
 
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