A number is an abstract mathematical unit which is subjected to the laws of arithmetic.
Hence, the correct option is “A”.

Explanation of Solution
Number:
- A number is actually a mathematical object used for counting, labeling and measuring.
- There are many types of numbers such as
- Natural numbers
- Whole numbers
- Negative numbers
- Rational numbers
- Irrational numbers
- Positive numbers
- Numbers are mainly used for arithmetic operations such as addition, subtraction, multiplication, division and so on.
- The study of properties of number is known as number theory.
Explanation for incorrect options:
b. Natural number:
A natural number is a type of number. Natural numbers are positive integers or whole numbers such as 1, 2, 3 and so on and sometimes 0 as well.
Hence, the option “B” is wrong.
c. Integer number:
An integer number is also a type of number. It is a whole number that can be positive, negative or zero.
Hence, the option “C” is wrong.
d. Negative number:
A negative number is also a type of number. It is a real number which is less than zero.
Hence, the option “D” is wrong.
e. Rational number:
Rational number is also a type of number. It is any number that can be expressed as fraction or as a quotient.
Hence, the option “E” is wrong
Want to see more full solutions like this?
Chapter 2 Solutions
COMPUTER SCIENCE ILLUMINATED
- Tracing the Recursion. Tracing the Recursion. Observe the recursive solution provided below. 1. Which line(s) of this program define(s) the base case of sumOfDigits() method? 2. Which line(s) of this program include recursive call(s)? 3. Trace the recursion below. You must show the trace step by step; otherwise – little to no credit! 4. Show me the final result! 1 public class SumOfDigitsCalculator { 30 123456 7% 8 public static void main(String[] args) { System.out.println(sumOfDigits(1234)); } public static int sumOfDigits (int number) { if (number == 0) 9 10 11 12 } 13 } else return 0; return number % 10 + sumOfDigits (number / 10);arrow_forwardmodule : java 731 Question3: (30 MARKS) Passenger Rail Agency for South Africa Train Scheduling System Problem Statement Design and implement a train scheduling system for Prasa railway network. The system should handle the following functionalities: 1. Scheduling trains: Allow the addition of train schedules, ensuring that no two trains use the same platform at the same time at any station. 2. Dynamic updates: Enable adding new train schedules and canceling existing ones. 3. Real-time simulation: Use multithreading to simulate the operation of trains (e.g., arriving, departing). 4. Data management: Use ArrayList to manage train schedules and platform assignments. Requirements 1. Add Train Schedule, Cancel Scheduled Train, View Train Schedules and Platform Management 2. Concurrency Handling with Multithreading i.e Use threads to simulate train operations,…arrow_forwardplease answer my 2 java questions correctly , include all comments etc and layout and structure must be correct , follow the requirementsarrow_forward
- Question3: Passenger Rail Agency for South Africa Train Scheduling System Problem Statement (30 MARKS) Design and implement a train scheduling system for Prasa railway network. The system should handle the following functionalities: 1. Scheduling trains: Allow the addition of train schedules, ensuring that no two trains use the same platform at the same time at any station. 2. Dynamic updates: Enable adding new train schedules and canceling existing ones. 3. Real-time simulation: Use multithreading to simulate the operation of trains (e.g., arriving, departing). 4. Data management: Use ArrayList to manage train schedules and platform assignments. Requirements 1. Add Train Schedule, Cancel Scheduled Train, View Train Schedules and Platform Management 2. Concurrency Handling with Multithreading i.e Use threads to simulate train operations, Each train runs as a separate thread, simulating its arrival, departure, and travel status. 3. Use ArrayList to manage train schedules for each…arrow_forwardplease answer my java question correctly , include all comments etc and layout and structure must be correct , follow the requirementsarrow_forwardplease answer my java question correctly , include all comments etc and layout and structure must be correct , follow the requirementsarrow_forward
- please answer my java question correctly , follow all requirements , add all commets etc and layout and structure must be perfect tooarrow_forwardplease answer my java question correctly , include all comments etc and layout and structure must be correct , follow the requirementsarrow_forward7. Long-Distance CallsA long-distance provider charges the following rates for telephone calls: Rate Category Rate per MinuteDaytime (6:00 a.m. through 5:59 p.m.) $0.07Evening (6:00 p.m. through 11:59 p.m.) $0.12Off-Peak (midnight through 5:59 a.m.) $0.05Write a GUI application that allows the user to select a rate category (from a set of radio buttons), and enter the number of minutes of the call into an Entry widget. An info dialog box should display the charge for the call.arrow_forward
- Name and Address The Name and Address Problem Write a GUI program that displays your name and address when a button is clicked. The program’s window should appear as the sketch on the left side of Figure 13-61 when it runs. When the user clicks the Show Info button, the program should display your name and address, as shown in the sketch on the right of the figure.arrow_forwardExercise 1 Function and Structure [30 pts] Please debug the following program and answer the following questions. There is a cycle in a linked list if some node in the list can be reached again by continuously following the next pointer. #include typedef struct node { int value; struct node *next; } node; int 11_has_cycle (node *first) if (first == node *head = { NULL) return 0; first; while (head->next != NULL) { } if (head first) { return 1; } head = head->next; return 0; void test ll_has_cycle () { int i; node nodes [6]; for (i = 0; i < 6; i++) { nodes [i] .next = NULL; nodes [i].value = i; } nodes [0] .next = &nodes [1]; nodes [1] .next = &nodes [2]; nodes [2] .next = &nodes [3]; nodes [3] .next nodes [4] .next &nodes [4]; NULL; nodes [5] .next = &nodes [0]; printf("1. Checking first list for cycles. \n Function 11_has_cycle says it has s cycle\n\n", 11_has_cycle (&nodes [0])?"a":"no"); printf("2. Checking length-zero list for cycles. \n Function 11_has_cycle says it has %s…arrow_forwardhow to read log logsarrow_forward
- Database System ConceptsComputer ScienceISBN:9780078022159Author:Abraham Silberschatz Professor, Henry F. Korth, S. SudarshanPublisher:McGraw-Hill EducationStarting Out with Python (4th Edition)Computer ScienceISBN:9780134444321Author:Tony GaddisPublisher:PEARSONDigital Fundamentals (11th Edition)Computer ScienceISBN:9780132737968Author:Thomas L. FloydPublisher:PEARSON
- C How to Program (8th Edition)Computer ScienceISBN:9780133976892Author:Paul J. Deitel, Harvey DeitelPublisher:PEARSONDatabase Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781337627900Author:Carlos Coronel, Steven MorrisPublisher:Cengage LearningProgrammable Logic ControllersComputer ScienceISBN:9780073373843Author:Frank D. PetruzellaPublisher:McGraw-Hill Education





