Programming & Computer Science Answers

Early versions of UNIX were available only with a command-driven interface. In more recent years, graphical user interfaces became popular. Explain in your own words why these GUIs made an impact on the popularity of this operating system.

Discuss and make summary notes about the following terminologies:

1. stack operations

2. stack applications

3. stack errors

4. queue operations

5. queue applications

Devise the algorithm for the following and verify whether they satisfy all the features.

1.An algorithm that inputs three numbers and outputs them in ascending order.

2.To test whether the three numbers represent the sides of a right angle triangle.

3.To test whether a given point p (x,y) lies on x-axis or y-axis .

4.To compute the area of a circle of a given circumference

5.To locate a specific word in a dictionary

2. Consider the ER diagram in Figure, which shows a simplified schema for an airline reservations system. Extract from the ER diagram the requirements and constraints that produced this schema. List and identify entities, attributes, relationships and keys. 

1. Consider the following set of requirements for a UNIVERSITY database that is used to keep track of students’ transcripts

a. The university keeps track of each student’s name, student number, Social Security number, current address and phone number, permanent address and phone number, birth date, sex, class (freshman, sophomore, ..., graduate),major department, minor department (if any), and degree program(B.A., B.S., ..., Ph.D.). Some user applications need to refer to the city,state, and ZIP Code of the student’s permanent address and to the student’slast name. Both Social Security number and student number have unique values for each student.

b. Each department is described by a name, department code, office number,office phone number, and college. Both name and code have unique values for each department.

c. Each course has a course name, description, course number, number of semester hours, level, and offering department. The value of the course number is unique for each course

Create an application for a Pizza delivery company. The application must provide a place for the user to enter their contact information (address, cell, telephone, e-mail) and some of the contact information should be displayed when the order is placed. Your application should have a picture logo and company name. Provide selections such as small, medium and large for pizza (Vegetarian, Hawaiian, Something Meaty….etc). BE CREATIVE You can also sell wings, mini-loaves, chicken strips or any other restaurant food of your choice. Also include beverages. You must display the price for the order and reset the order form. Experiment, explore, change properties and the review the .Designer.cs.file

Develop an algorithm in form of a pseudocode to solve the following problem: You are given an array of positive numbers, determine if there are any two integers in the array whose sum is equal to the given value X, and display all pairs of integers in the array that add up to X. Look at the below test case to guide you. (NB: do not write a C++ program but pseudocode) [5 Marks] Array: {7,1,2,8,4,3} Target sum/value (X)= 10 Expected Output: 7 + 3 = 10, 2 + 8 = 10 

The average age to obtain a driver’s licence is 18. Write a Java program where the user enters his / her age. If the age is greater than or equal to 18, the program must display using JOptionPane the following message, “you are old enough to apply for a driver’s licence”, else display the following message, “you are not old enough to apply for a driver’s licence”.