When this code is run it has errors. Could someone please help me figure this ou

Question

When this code is run it has errors. Could someone please help me figure this out?

p = list;
q = next(p);

while (q! == null)
{
   if(next(q! == null)
   {
      insAfter q, x);
   }
   else
   {
      p = q;
      q = next(q);
   }
}

//e. Delete last element from list
p = list;
q = next(p);

if(p == null)
{
   System.out.println("Void deletion");
   System.exit(1);
}
else
{
   while (q! == null)
   {
      if (next (p) == null)
      {
         next(p) = null;
         freenode (q);
      }
      else
      {
         p = q;
         q = next(q);
      }
   }
}

//f. Delete nth element from list
int n;
p = list;
q = next(p);
if(p == null)
{
System.out.println("Void deletion");
System.exit(1);

}
else
{
   for (int i = 0; i < n; i++)
   {
      p = q;
      q = next(q);
   }
   next(p) = null
   freenode(q);
   }

//j. Insert an element after the nth element
int n;
p = list;
q = next(p);

for (int i = 0; i < n; i++)
{
   p = q;
   q = next(q);
}
insAfter (q, x);

//n. Return number of elements in list
p = list
int i = 0;
while (p! - null)
{
   i++;
   p = next(p);
}
System.out.println("The number of elements in list is:" + i);

Explanation / Answer

p = list;
q = next(p);

while (q! == null)
{
   if(next(q! == null)
   {
      insAfter q, x);
   }
   else
   {
      p = q;
      q = next(q);
   }
}

//e. Delete last element from list
p = list;
q = next(p);

if(p == null)
{
   System.out.println("Void deletion");
   System.exit(1);
}
else
{
   while (q! == null)
   {
      if (next (p) == null)
      {
         next(p) = null;
         freenode (q);
      }
      else
      {
         p = q;
         q = next(q);
      }
   }
}

//f. Delete nth element from list
int n;
p = list;
q = next(p);
if(p == null)
{
System.out.println("Void deletion");
System.exit(1);

}
else
{
   for (int i = 0; i < n; i++)
   {
      p = q;
      q = next(q);
   }
   next(p) = null
   freenode(q);
   }

//j. Insert an element after the nth element
int n;
p = list;
q = next(p);

for (int i = 0; i < n; i++)
{
   p = q;
   q = next(q);
}
insAfter (q, x);

//n. Return number of elements in list
p = list
int i = 0;
while (p! - null)
{
   i++;
   p = next(p);
}
System.out.println("The number of elements in list is:" + i);

in while loop , just remove ! operator or bcoz you should perform only != or == operator only and last while loop you need to use same thing but u have used !- its not valid. please check after remove above .

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