Computer-science Textbooks (72)

Consider the relation Student Performance below which describes student performance in courses. The value stored in the gradePoint column is the grade point that corresponds to the grade received in a course. Assume that students are identified by their student number, and that courses are identified by their course id. Assume each student can take a course only once and so each row is uniquely identified by {stuNum, courseId}. Each student’s overall gpa is stored – gpa is the average of gradePoint for all courses taken by a student.

The following program contains a logic error. Describe where to insert the appropriate debugging statements to help locate the error: import java. util. Scanner; public class AreaTriangle\\{ public static void main(String [] args) \\{ double base, height, area; Scanner reader = new Scanner (System. in); System.out.print("Enter the base of the triangle:"); base \(=\) reader nextDouble( ); system.out.print("Enter the height of the triangle: "); height = reader.nextDouble(); area \(=\) base \(+\) height \(/ 2\); system.out.println("The area is " + area);

Let \(p\) denote the population density, and let it depend on time \(t\) and age \(r\). The number of people of ages between \(r\) and \(r+d r\) at a certain time \(t\) is given by \(p(t, r) d r\). Define the mortality rate \(\mu(t, r)\) in the following way: \(\mu(t, r) d r d t\) is the fraction of people in the age class \([r, r+d r]\) who die in the time interval \([t, t+d t]\). Based on the infinitesimal equality $$ p(t+d t, r+d t) d r-p(t, r) d r=-\mu p d r d t . $$ Show that \(p\) satisfies the following partial differential equation $$ \frac{\partial p}{\partial r}+\frac{\partial p}{\partial t}=-\mu p $$ Let the initial age distribution be given as $$ p(0, r)=p_{0}(r), \quad 0 \leq r \leq 1 $$ and the birth rate function as the boundary condition $$ p(t, 0)=u(t), \quad t \geq 0 . $$ Here it assumed that the age \(r\) is scaled in such a way that nobody reaches an age \(r>1\). One can consider \(u(t)\) as the input to the system and as output \(y(t)\) for instance the number of people in the working age, say between the ages \(a\) and \(b\), \(0

Suppose Client A initiates a Telnet session with Server S. At about the same time, Client B also initiates a Telnet session with Server S. Provide possible source and destination port numbers for a. The segments sent from \(\mathrm{A}\) to \(\mathrm{S}\). b. The segments sent from \(B\) to \(S\). c. The segments sent from \(S\) to \(A\). d. The segments sent from \(S\) to \(B\). e. If \(A\) and \(B\) are different hosts, is it possible that the source port number in the segments from \(\mathrm{A}\) to \(\mathrm{S}\) is the same as that from \(\mathrm{B}\) to \(\mathrm{S}\) ? f. How about if they are the same host?

Create a date object of your day of birth.