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3 years ago

In the following code, what is the first line that introduces a memory leak into the program?

Computers and Technology

1 answer:

Bingel [31]3 years ago

3 0

Answer:

The description of the given code is given below:

Explanation:

Memory leak:

In a program, if memory is assigned to the pointer variables but that memory is already released previously then the condition of occurring the memory leakage.

Now the program :

#include <stdio.h> //header file

#include <stdlib.h> //header file

#include <string.h> //header file

int main() //main function

{

char *word1 = NULL; //line 1 (as given in the question)

word1 = malloc(sizeof(char) * 11); //line 2

free(word1); //free the memory of pointer word1 line 3

word1 = "bramble"; //line 4

char *word2 = NULL; //line 5

word2 = malloc(sizeof(char) * 11); //line 6

free(word2); //free the memory of pointer word2 line 7

word2 = word1; //line 8

return 0; //line 9

}

Therefore, line 3 is the first line that introduce a memory leak anf after that line 7 introduce it in a program.

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4 years ago

In this assignment, you are to create a class named Payroll. In the class, you are to have the following data members: name: Str

wlad13 [49]

Answer:

Here is the PayRoll class:

// PayRoll.java

package payroll; // creates payroll package for project

public class Payroll { //class definition

private String name; //private String type member variable to store name

private String id; //private String type member variable to store id

private int hours; //private int type member variable to store work hours

private double rate; //private double type member variable to store payrate of the employee

public Payroll() { //no argument constructor of PayRoll

name = ""; //initialize name field

id = ""; //initialize id field

hours = 0; //initialize hours field

rate = 0.0; } // initialize rate field

public Payroll(String NAME, String ID, int HOURS, double RATE) { //parameterized constructor

setName(NAME); //sets name value

setId(ID); //sets id value

setHours(HOURS); //sets hours value

setRate(RATE); } //sets rate value

public void setName(String NAME) { //mutator method to set name

if(NAME.equals("")) { //if name field is empty

throw new IllegalArgumentException("An employee name should not be empty."); } //throws exception

name = NAME; }

public void setId(String ID) { //mutator method to set id

if(ID.length() != 3 || !Character.isLetter(ID.charAt(0))|| !Character.isDigit(ID.charAt(1)) || !Character.isDigit(ID.charAt(2))) { //if statement checks if the length of the id is not 3, or first character of id is not a letter, or second or third character of id is not a digit

throw new IllegalArgumentException("An employee id should have the form LNN."); } //throws exception

id = ID; }

public void setHours(int HOURS) { //mutator method to set hours

if(HOURS < 0 || HOURS > 84) { //checks if working hours are less than 0 or greater than 84

throw new IllegalArgumentException("An employee's hours should neither be negative nor greater than 84"); } //throws exception

hours = HOURS; }

public void setRate(double RATE) { //mutator method to set rate

if(RATE < 0 || RATE > 25.00) { //checks if pay rate is less than 0 or greater than 25.00

throw new IllegalArgumentException("An employee's pay rate should neither be negative nor greater than 25.00"); } //throws exception

rate = RATE; }

public String getName() { //accessor method to get value of name

return name; } //returns the current value of name

public String getId() { //accessor method to get value of id

return id; } //returns the current value of id

public int getHours() { //accessor method to get value of hours

return hours; } //returns the current value of hours

public double getRate() { //accessor method to get value of rate

return rate; } } //returns the current value of rate

Explanation:

Here is the Main() class:

import java.util.Scanner; //to accept input from user

public class Main { //Main class definition

public static void main(String[] args) {//start of main() function

Payroll pay = new Payroll(); //creates object i.e. pay of PayRoll class

Scanner sc = new Scanner(System.in); //creates Scanner class object

String name,id; //declare variables to hold name and id

int hour; //declare variable to store hour

double rate; //declare variable to store pay rate

System.out.print("Enter the employee's name: "); //prompts user to enter employee name

name = sc.nextLine(); //reads input value of name

pay.setName(name); //use pay object to access mutator method to set name to input name value

System.out.print("Enter employee's id (LNN form): "); //prompts user to enter employee id

id = sc.nextLine(); //reads input value of id

pay.setId(id); //use pay object to access mutator method to set id to input id

System.out.print("Enter the employee's working hours: "); //prompts user to enter employee hours

hour = sc.nextInt(); //reads input value of hour

pay.setHours(hour); // set input hours

System.out.print("Enter the employee's pay rate: "); //prompts user to enter employee pay rate

rate = sc.nextInt(); //reads input value of rate

pay.setRate(rate); // set pay rate

System.out.println("Employee Data: \n"); //displays the employee data

System.out.println("Employee's Name: " + pay.getName()); //calls getName accessor method to get current value of name field and display it

System.out.println("Employee's ID: " + pay.getId()); //calls getId accessor method to get current value of id field and displays it

System.out.println("Employee's Hours: " + pay.getHours()); //calls getHours accessor method to get current value of hours field and displays it

System.out.println("Employee's Pay Rate: " + pay.getRate()); //calls getRate accessor method to get current value of rate field and displays it

}

Here IllegalArgumentException is thrown which is used to show that a method is passed an illegal argument.

The screenshot of program and its output is attached.

5 0

3 years ago