Average Of Numbers With Sentinel Value Equals To 0
Mar 27, 2014
(Count positive and negative numbers and compute the average of numbers). Write a program that reads an unspecified number of integers, determines how many positive and negative values have been read, and computes the total and average of the input values (not counting zeros). Your program ends with the input 0. Display the average as a floating-point number.
I moved the different boolean statements around, but I'm not getting the sentinel value to end the run. It continues to let me add integers endlessly. The code I wrote is below:
package exerciseFourOne;
import java.util.Scanner;
public class AverageOfIntergers {
public static void main(String[] args) {
// TODO Auto-generated method stub
int positive = 0; // number of positive integers
int negative = 0; // number of negative integers
int sum = 0; // value of sum of integers
[Code] .....
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Jan 7, 2014
I am trying to override the equals method for my class TeamMember I have two fields:
private Details details;
private double salary;
Code for override I get an error on salary saying cannot invoke equals (double) on the primitive type (double)
Is their something I am missing/coding wrong?
Java Code:
public boolean equals(Object obj) {
//test exceptional cases
//avoid potential NullPointerException/ClassCastException
if ((obj == null) || (this.getClass() != obj.getClass()))
return false;
TeamMember other = (TeamMember) obj; //cast to a TeamMember object
// compare fields details and salary
return this.details.equals(other.details)
&& this.salary.equals(other.salary);
} mh_sh_highlight_all('java');
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Jan 25, 2014
How to create a simple program that can input number from 1 to n. and display the numbers which input by the user and also display the sum and average of it.
Ex.
Please input a number:
1 2 3 4 5 6 7 8 9 10
the sum numbers of 12345678910 is 55
the average number of 12345678910 is ______,
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May 26, 2015
I have the following methods:
public static int getSum(int[] data) {
int sum = 0;
for (int i = 0; i < data.length; i++) {
sum += data[i];
}
return sum;
[code]....
The input is the following arary (Its from the Junit test that fails this): [Integer.MIN_VALUE, -1, 0, 1, Integer.MAX_VALUE].I get an average of 0.0 when it should be -0.2.
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Feb 25, 2015
Java program : For this assignment you are going to write code for the following class:
MathOnThreeNumbers
Here are the specifications of class MathOnThreeNumbers:
Methods of class MathOnThreeNumbers:
1. inputThreeNumbers
2. getAverage
3. getSum
4. getNumberOne
5. getNumberTwo
6. getNumberThree
Constructor of class MathOnThreeNumbers
write a constructor that initializes the first, second, and three numbers to 1, 2, and 3 respectively.
Specs for the methods methods:
1.
name: inputThreeNumbers
accessibilty: public
arguments: none
what it does: asks the user for three numbers of type double
2.
name: getAverage
accessibilty: public
arguments: none
what it does: returns average of the three numbers
3.
name: getSum
accessibilty: public
arguments: none
what it does: returns sum of the three numbers
4.
name: getNumberOne
accessibilty: public
arguments: none
what it does: returns the first number entered by the user
5.
name: getNumberTwo
accessibilty: public
arguments: none
what it does: returns the second number entered by the user
6.
name: getNumberThree
accessibilty: public
arguments: none
what it does: returns the third number entered by the user
Here is an example of how the class MathOnThreeNumbers works. The following code produces the output displayed after the code.
MathOnThreeNumbers mm = new MathOnThreeNumbers();
System.out.println("first: " + mm.getNumberOne());
System.out.println("second: " + mm.getNumberTwo());
System.out.println("third: " + mm.getNumberThree());
mm.inputThreeNumbers();
[Code] .....
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May 21, 2015
For some reason, the averages aren't calculating correctly. I'm aware I need to convert to double if I'm dividing by an odd amount but that itself isn't the issue. It's just simple easy divisible numbers that are not being calculated correctly. For instance, (10 + 10 + 10 + 50) / 4 = should be 2 but I get 10.
Here is the code:
import java.util.Scanner;
public class Avg {
public static void main(String[] args){
Scanner inputGains = new Scanner(System.in);
int userInput = inputGains.nextInt();
[Code] ....
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Sep 5, 2014
Write a program that will read unspecified numbers of scores . The program will output the average of these scores and the scores that are below and above the average.
Example..
1
2
3
4
5
Average is 3
Below 1
2
Above
4
5
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Feb 26, 2014
It does not calculate the maximum, minimum or average of the 10 numbers that the user is prompted to input.
My code:
import java.util.Scanner;
public class moretest {
public static void main( String [ ] args ) {
int total = 0;
int number;
int minGrade = 101;
[code]...
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Sep 27, 2013
I have been having difficulty with the weeks concepts in my online Java class, the program is to be as followed:
For this exercise you will implement a class called Pair, that represents a pair of two numbers.The Pair class should include the following constructor and methods:
CONSTRUCTORS
public Pair(double num1, double num2) -- Creates an object that represents a pair of double values
METHODS
public double getAverage() -- Returns the average value of the two numbers
public double getDistance() -- Returns the absolute vale of the distance between the two numbers
public double getMaximum() -- Returns the maximum value of the two numbers
public double getMinimum() -- Returns the minimum vale of the two numbers
Write a class called PairTest that tests your Pair implementation. The PairTest should prompt the user for the two values, create a Pair object with the values and then print the average, distance, maximum, and minimum of the pair. The input / output should look like the following:
Enter the first number: 5.5
Enter the second number: 3.0
Average: 4.25
Distance: 2.5
Maximum: 5.5
Minimum: 3.0
NOTE: For this exercise, your solution should not use any conditional statements. Instead you should use the methods provided by thejava.util.Math.
So far I have:
import java.lang.Math;
import java.util.Scanner;
public class Main
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
{
System.out.println("Please enter a value for the first number");
[Code] ....
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Mar 28, 2014
Create an equals method that takes an object reference and returns true if the given object equals this object.
Hint: You'll need 'instanceof' and cast to a (Geocache)
So far I have:
public boolean equals(Object O){
if(O instanceof Geocache){
Geocache j=(Geocache) O;
if (this.equals(j)) //I know this is wrong... but I can't figure it out
return true;
}
else return false;
}
I think I have it correct up to the casting but I don't understand what I'm suppose to do with the this.equals(). Also I'm getting an error that I'm not returning a boolean... I get this all the time in other problems. I don't get why since I have to instances of returning booleans in this. "returns true if the given object equals this object" makes no sense to me. I assume the given object, in my case, is 'O'. What is 'this' object referring to?
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Mar 24, 2014
So the question asks us to use a sentinel value to end a program, but the sentinel value is 999, but the while loop only recognises strings...
static Scanner console = new Scanner (System.in);
public static void main (String[] args)
throws FileNotFoundException
{
PrintWriter outfFile = new PrintWriter ("Invoice.txt") ;
String firstItem;
String item ;
int price;
[Code] .....
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Mar 1, 2014
how to use the CTRL-D in my program. The program records the amount of times a positive and negative integer is typed. When the user decides to end the program, they will use the CTRL-D to terminate the program. After the button combination has been pressed, I spit out to the user the results. The problem is when I press CTRL-D the program just terminates and I can't even get it to read the next line of code. ....
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Jun 10, 2014
I'm new to Java and am trying to create a simple payroll program that uses a while loop to repeat until the user enters "Stop" for the employee's name. I've tried everything I can think of and everything others have suggested and for some reason, I cannot get the program to differentiate between the word "Stop" or any other word. what I'm doing wrong? My code is as follows:
import java.util.Scanner; // imports scanner class for user input
public class Payrolltest {
public static void main( String[] args )// begins execution of program {
Scanner input = new Scanner( System.in ); // creates a scanner to obtain user input
String Employee = "name"; // employee's name
[code]...
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Sep 25, 2014
The program is supposed to print all even and odd numbers between 50 and 100 using ONE while or do while loop. The evens work, but the program terminates after printing 51 for the odds, which doesn't satisfy the second value sentinel value for the while loop.
public class EvenOdd {
public static void main(String args[]) {
int x = 50;
int y = 50;
int i = 0;
int j = 0;
System.out.print("Even numbers between 50 and 100: ");
[Code] ....
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Nov 28, 2014
I am working on this object oriented sentinel problem but when i am running it, its showing error.
import java.util.Scanner;
public class example1 {
private String gasmilage;
public example1(String milage){
milage=gasmilage;
[code]....
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Sep 30, 2014
having a hard time with my do while loop. for some reason in my else if structure it will break when i using .equals in the do while loop. But if i try doing tmp == "D" || tmp == "d" it will keep looping how can i go about using alternative for .equals?
Here is my code:
do {
Object object = new Object();
System.out.println("For a deposit Enter: D
Withdrawal Enter: W
"
+ "or 'Quit' to exit.");
String tmp = input.next();
if (tmp.equals("D"))
[Code] ....
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Apr 9, 2014
Write a java program that will ask a user to input grades until the user inputs the sentinel value -1. The program should test each input to determine whether 0<=grade<=100. If the grade entered is within this range, the program should print "Grade accepted;" if not, the program should print "Invalid input".
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May 15, 2014
Its that very old question regarding hashcode and equals implementation which i am not getting .
import java.util.*;
public class MyElement {
public static void main(String a[]){
HashSet<Price> lhm = new HashSet<Price>();
lhm.add(new Price("Banana", 20));
lhm.add(new Price("Apple", 40));
[Code] .....
In the above program even if i comment out the Hashcode method , i believe it is still taking the memory address values from the native hashcode method of Object class. but the equals override implentation says that i have two insertions which are same . So as per my logic it should not allow the duplicate element to enter.but its not so ...the duplicate element is well inserted without hashcode .
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Jan 12, 2015
All I am trying to do is to make a section of code execute if two strings are equal. The two strings are userId and "A001062". When I use the debugger in Eclipse, I can see the value of userId as "A001062" but whatever string comparison I try never evaluates to true. I have tried
userId=="A001602"
userId.equals("A001602")
"A001602.equals(userId)
Assigning A001062 to a string called AAA and comparing userId to AAA
My code is as follows. I have also attached a screen shot from the Eclipse Debugger which makes me think the string comparison should succeed. I never see the debugger execute the print line nor do I see the print line on the JBOSS console.
String userId = StringUtils.trim(nextLine[HR_USER_ID]);
String AAA="A001062";
if (userId.intern().equals(AAA.intern())) {System.out.print("MKP1: " + userId+"-"+managerId);}
if (userId.compareTo("DTS0428")==0) {System.out.print("MKP2: " + userId+"-"+managerId);}
Attached image(s)
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Mar 26, 2014
I have to create a class that has two fields. One called length and the other width. I have to make a method that returns the tract area. Similarly, I also have to make a method that indicates whether two objects have the same fields. Here is the code that I have assembled...so far
// create private fields to hold width and length
private double width;
private double length;
[Code].....
My problem is encountered when writing that equals method
if(length.equals(object.length) && width.equals(object.width))
I get an error saying HTML Code: cannot invoke equals(double) on the primitive type double. Meanwhile, I do see, to realize that when I change my fields to capital "Double." The problem disappears; however, in my class I have never dealt with a situation where I have to use capital d in double. In fact, I don't even know what's the difference between Double and double. I do know what double is but not the other one..
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Jul 14, 2014
In Java code, write class called Student with the following features:
• a private instance variable int studentNumber that is initialized to zero.
• a private instance variable String firstName;
• a private instance variable String lastName;
• a constructor which takes an integer argument and two String arguments to initializes the three respective data items.
• a public method with signature equals(Student s) . . .
So far this is my code :
public class student {
private int studentnumber = 0;
public student () {
firstname= "forename":
lastname="surname":
public student (integer studentnumber, string firstname, string lastname) {
this.firstname= firstname
this.lastname= lastname:
My question is how do i add the integer in the argument do i have to use int =? and how would i go about doing the public signature equals...
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Mar 25, 2015
Im working on a roman numeral to arabic converter and all I had to do was fill out the conversion method romanToDecimal. But for some reason no matter what number I enter It always says my number is equal to one.
//Quiz 1 EC
import java.util.*;
class Roman {
private String romanNum;
private int decimalNum;
public Roman(){
romanNum = "I";
decimalNum = 1;
[code]....
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Oct 2, 2014
For a few days I've been reading about the importance of overriding the equals method. How overriding it actually determines or checks the values stored in the variable. I realize that you can check the values stored in the primitive datatypes with "==", and when you don't override the equals method it acts the same way, right? When used with a reference datatype, "==" or the default equals() method only compares, or sees, if the variable is pointing to the same instance of a class. For some reason, in the examples, what is taking place to actually check the values stored inside the variables.
Here is part of an example (I've added comments for things that are confusing me):
@Override
public boolean equals(Object obj) {
//So we use Object here instead of the class type
// we're overriding this equals method for?
Is this so that we can use it to check different types? (overloading?)
if (obj == this) {
return true;
//Isn't this checking to see if the calling object is the same as the object we're passing to it?
Why doesn't this return false?
}
if (obj == null || obj.getClass() != this.getClass()) {
return false;
}
//How exactly do we check the values stored in each object though?
}
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Jul 6, 2014
I was reading a book and came across this while loop.
public class Powers {
public static void main (String [] args){
int e;
int result;
for(int i = 0; i < 10; i++){
[Code] .....
This loop presents the following (I'm sure it's not necessary):
2 to the 0 power is 1
2 to the 1 power is 2
2 to the 2 power is 4
2 to the 3 power is 8
2 to the 4 power is 16
2 to the 5 power is 32
2 to the 6 power is 64
2 to the 7 power is 128
2 to the 8 power is 256
2 to the 9 power is 512
I am just having a difficult time understand and grasping this concept. My main issue is result *=2; this is making it very difficult to understand. How is result being replace if it only equals to 1.
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Jan 12, 2015
All I am trying to do is to make a section of code execute if two strings are equal. The two strings are userId and "A001062". When I use the debugger in Eclipse, I can see the value of userId as "A001062" but whatever string comparison I try never evaluates to true. I have tried
userId=="A001602"
userId.equals("A001602")
"A001602.equals(userId)
Assigning A001062 to a string called AAA and comparing userId to AAA
My code is as follows. I have also attached a screen shot from the Eclipse Debugger which makes me think the string comparison should succeed. I never see the debugger execute the print line nor do I see the print line on the JBOSS console.
String userId = StringUtils.trim(nextLine[HR_USER_ID]);
String AAA="A001062";
if (userId.intern().equals(AAA.intern())) {System.out.print("MKP1: " + userId+"-"+managerId);}
if (userId.compareTo("DTS0428")==0) {System.out.print("MKP2: " + userId+"-"+managerId);}
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May 5, 2014
I am attempting to override the equals method from the Object class which checks if two variables point towards the same object. I want the method to check if if the argument being passed in(an object) has the same data(instance variables) as the object that's calling this method. A NullPointerException is being thrown; Here is the code.
package javaapplication5;
import java.text.NumberFormat;
import java.util.Scanner;
import java.lang.Object;
public class Product {
private String product;
private String description;
private double price;
[Code] ....
And here is the stack trace
Exception in thread "main" java.lang.NullPointerException
at javaapplication5.Product.equals(Product.java:42)
at javaapplication5.Product.main(Product.java:24)
Java Result: 1
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