Programming & Computer Science Answers

Write a Java GUI application that will keep track of a user's contact list. The application must contain the contact mobile number, work number and email address

Q.3.1

On the form, create a list box that will allow the user to select a contact name, which is populated from a text file. Also create a search button that when clicked will display the mobile number, work number and email address.

Create a sequential file (contacts.txt) that contains data for the following fields

Q.3.2

The contact name;

The contact mobile number,

The contact work number:

The contact email address

Q.33

Load the data from the contacts txt file and populate the list bax with the contact names Include a feature to inform the user on the amount of contacts

Sample Screenshot:

Contacts Application

Select Contact

Joe Bloggs

Jeff Jones

Mobile

072 157 1545

Work

021 5555555

Email

@gmail.com

Number of contacts: 2

SEARCH

Your colleague, John, has been struggling with a PL/SQL query

Identify the errors and re‐write the correct code:

set serveroutput on

 c_id CUSTOMER.cust_id%Type;

 t TOWNHOUSE.house_num%Type;

 m_name MATERIALS.material_name%Type;

cursor info is

select cu.cust_id, t.house_num, m.material_name

from CUSTOMER cu, TOWNHOUSE t, MATERIALS m, PURCHASE_AGREEMENT pa

where cu.cust_id = pa.cust_id

and t.house_num = pa.house_num

and m.material_id = pa.material_id

begin

for rec in info

 c_id:=rec.cust_id;

 t:= rec.house_num;

 m_name:=rec.material_name;

 dbms_output_put_line('CUSTOMER ID:  ' || c_id || ', ' || chr(13) ||'HOUSE NUM:   ' || t ||

chr(13) || 'MATERIALS:   ' || m_name);

 dbms_output.put_line('‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐');

end loop;

Describe the difference between a chained conditional and a nested conditional. Give your own example of each. Do not copy examples from the textbook.

Deeply nested conditionals can become difficult to read. Describe a strategy for avoiding nested conditionals. Give your own example of a nested conditional that can be modified to become a single conditional, and show the equivalent single conditional. 

A vegetable shop owner maintains the data in a doubly linked list. Write a menu-driven program that maintains a doubly linked list. Each vegetables node must contain the features: unique id, date of inclusion in stock, vegetable name, shape, raw eating/cooking feature, weight, price per kilogram. Execute all the following operations and attach screenshots of outputs along with code typed/written (code screenshot will not be allowed) in the submission pdf file. 1. Inclusion of 2 different type of vegetables. 2. Display data of all vegetables in stock nodes. 3. Delete a node based on searching criteria – i) stock inclusion date is 10 days ago and ii) if a customer buys a vegetable and weight of that vegetable in stock has reached to zero. 4. Inclusion of two new vegetables (same or different). 5. Display data of all vegetables in stock. 

Given the Table 1 below that shows the Malaysia Ringgit currency exchange rate at Bank A. Draw the flowchart to design the logical flow for currency rate calculator. User needs to key-in the amount of Ringgit Malaysia he/she has and choose currency code target. Your currency rate calculator needs to calculate the amount obtained after the conversion according to the rate shows in Table 1 and display it to the user.

Calculation Example:

Amount: 8 Malaysian Ringgit

Currency code Target: 131

Amount obtained: 8*0.51 = 4.08 Australian Dollar

Table 1

Currency code

Currency Name

Rate

110

Canadian Dollar

4.09

120

France Franc

2.09

125

Germany Mark

1.86

131

Australian Dollar

0.51

Design a network system where VC IDs will be assigned uniquely which avoids the VC ID collision at the routers. Since such a system avoids the VC ID collision at the router, it should definitely save the router's time and should improve the performance of the router. Consider Fig. 1 to prove your methodology (You should not use any other network diagrams). Output Expected: 1. Detailed Explanation of the methodology 2. The Routing Table Contents at time t , t + 10 , and t + 20 Seconds.

Write a C program to convert uppercase string to lowercase case string using strlwr() function.

Write a program to convert lowercase letter to uppercase struptr() function.

Write a C program to subtract two matrices using two dimensional array.

Sort {5, 1,12,-5, 16,2,12,14} using selection short