JAVA (I use Eclipse):

Implement the enqueue(int x), dequeue() function for Queue in Queue.java. Then, implement the search(int k), insert(int x), delete() function in LinkedList.java.

I already have Stack.java completed. I included the code for reference.

Please do not modify the original code. Only include additional missing code in the provided structure. Please make sure the program works.

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Below are the prepared codes to fill in:

package ds;

public class Stack {

public int size;

public int top;

public int[] array;

public Stack () {

size = 0;

top = -1;

array = null;

}

public Stack (int _size) {

size = _size;

top = -1;

array = new int[size];

}

/*

* Implement the Stack-Empty(S) function

*/

public boolean empty () {

return top == -1;

}

/*

* Implement the Push(S, x) function

*/

public void push (int x) {

if(top < size-1){

top++;

array[top] = x;

}

}

/*

* Implement the Pop(S) function

* Return -1 if the stack is empty

*/

public int pop () {

if(empty())

return -1;

int x = array[top];

top--;

return x;

}

/*

* Convert stack to string in the format of #size, [#elements]

*/

public String toString () {

String str;

str = size + ", [";

for (int i = 0; i <= top; i++)

str += array[i] + ", ";

str += "]";

return str;

}

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

Stack s;

s = new Stack(10);

for (int i = 0; i < 5; i++)

s.push(i);

System.out.println(s.toString());

for (int i = 0; i < 2; i++)

s.pop();

System.out.println(s.toString());

}

}

-----------------------------------

package ds;

public class Queue { public int size; public int[] array; public int head; public int tail; public Queue () { size = 0; array = null; head = -1; tail = 0; } public Queue (int _size) { size = _size; array = new int[size]; head = -1; tail = 0; } /* * Implement the ENQUEUE(Q, x) function */ public void enqueue (int x) { } /* * Implement the DEQUEUE(Q) function */ public int dequeue () { } /* * Convert queue to string in the format of #size, head, tail, [#elements] */ public String toString () { String str; str = size + ", " + head + ", " + tail + ", ["; for (int i = head; i%size < tail; i++) str += array[i] + ","; str += "]"; return str; }

/** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Queue q; q = new Queue(10); for (int i = 0; i < 5; i++) q.enqueue(i); System.out.println(q.toString()); for (int i = 0; i < 2; i++) q.dequeue(); System.out.println(q.toString()); }

}

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package ds;

public class LinkedList { public ListNode head; public LinkedList () { head = null; } /* * Implement the LIST-SEARCH(L, k) function */ public ListNode search (int k) { } /* * Implement the LIST-INSERT(L, x) function * Note that x is a integer value, not a ListNode */ public void insert (int x) { } /* * Implement the LIST-DELETE(L, x) function */ public void delete (ListNode x) { } /* * Convert a LinkedList to a string in the format of [#elements] */ public String toString () { String str; ListNode n; str = "["; n = this.head; while (n != null) { str += n.key + ","; n = n.next; } str += "]"; return str; } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub LinkedList l; l = new LinkedList(); for (int i = 0; i < 5; i++) l.insert(i); System.out.println(l.toString()); for (int i = 0; i < 2; i++) l.delete(l.head.next); System.out.println(l.toString()); }

}

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package ds;

public class ListNode { public int key; public ListNode prev; public ListNode next; public ListNode () { prev = next = null; } public ListNode (int _key) { key = _key; prev = next = null; } }