Mixed Mathematical Expression Error
May 28, 2014
I understand how mixing expressions of different data types can result in an error if the assigned variable is not the same data type. But I don't understand how the below causes an error:
short totalPay, basePay = 500, bonus = 1000;
totalPay = basePay + bonus; // This causes the error
500 + 1000 = 1500. 1500 falls within the short parameters. If basePay, bonus, and totalPay are all short, as well as the resulting equation, how is this erroring?
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Aug 6, 2014
How I'm supposed to write out the statement.
I am fairly certain that I should be making variable "b" and "c" a float. But beyond that I'm confused.
uploadfromtaptalk1407333378833.jpg
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Dec 15, 2014
So my EL expressions in my jsp are not taken into account in my project. It was working fine when I was using DAO but I switched my project to ORM using the annotations. Using Tomcat in the first place and now JBoss 7.2. Anyway take a look because I really don't understand what I have to do.
When I acces the page I create I get this : OyN3K.jpg while I'm supposed to have a form.
Example my connection jsp:
<title>Connection</title>
</head>
<body>
<form method="POST" action="connection">
<fieldset>
<legend><b>Connection</b></legend>
<c:import url="connectionForm.jsp" var="importedData"/>
[Code] ....
I don't think it's an error in my code but more or less a configuration problem. Btw I don't think it's a problem in my url since when I put a wrong one I've an error telling me it doesn't find the jsp file. That said it's clearly the ${} not being taken into account.
Here is the download link of my project: lab.zip
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Mar 17, 2014
Lines 7 , 10 ,13 .... All have a Illegal Start of Expression error.
[color=blue]private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
Random rd = new Random();
int random = 0;
random=rd.nextInt(6)+1;
switch(random){
[Code] ....
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Jun 11, 2014
I keep getting this error upon compiling and can't see the problem with it.
The error is on line "45: 15"
/* 37: */ public static EntityDef forID(int i)
/* 38: */ {
/* 39: 10 */ for (int j = 0; j < 20; j++) {
/* 40: 11 */ if (cache[j].type == i) {
/* 41: 12 */ return cache[j];
[Code] .....
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Jun 3, 2014
I'm working on a program and can't seem to fix my for loop error.I get an error at the for loop line saying illegal start of expression and i don't know how to fix it:
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package million;
import java.util.Scanner;
public class Million {
[code]....
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Apr 11, 2013
class Test1
{
public static void main(String args[])
{
void show()
{
System.out.print("its working");
}
show();
}
}
When I compile this program i find the error illegal start of expression
^void show
Test1.java5 ';' is expected
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Jan 10, 2014
Here is the code
public static void main(String[] args) {
Scanner Keyboard = new Scanner(System.in);
System.out.print("Please enter your name.");
String name = Keyboard.next();
name = "name";
[Code] ....
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Aug 3, 2014
I am trying to build an expression tree program . I try to print it then I have java.nullpointer exception . Is it error in my code or what ?
I have 2 classes
one is BSTreeNode which is the nodes for the tree . It has
public class ExpressionTree {
public BSTreeNode root;
public BSTreeNode curr = root;
ExpressionTree() {
root = new BSTreeNode(null, null, null, null);
curr = root;
[Code] ....
My BSTreeNode
public class BSTreeNode {
BSTreeNode parent;
Object element; // Binary search tree element
BSTreeNode left; // Reference to the left child
BSTreeNode right; // Reference to the right child
// Constructor
BSTreeNode (Object elem)
[Code] ....
The error i am getting is
Exception in thread "main" java.lang.NullPointerException
at binaryexpressiontree.ExpressionTree.insert(ExpressionTree.java:38)
at binaryexpressiontree.test.main(test.java:22)
Java Result: 1
After implementing exception handler what i am getting is
java.lang.NullPointerException
root 1 *
root 2 1 error error error//these error print because of my catch clause
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Jan 28, 2015
byte a1 = 0;
byte a2 = 4
byte a3 = 4;
//below statement gives a compilation error
a1 = a2 + a3;
//below line compiles fine.
a1 = 4 + 4;
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Sep 17, 2014
I want to declare integers, while the program is running.
I run the program and then I give it via System.in.println an integer and repeat this as long as I want. I want the program to give those integers a name of a certain type for, for example a(i) or a[i], dunno, (it should be handy) and then a(i) represents the the i'th integer I gave the program. My idea is then that I can use those elements by their name just like, if I had declared them in the first place. For example add two integers together. For example I defined a method add+, which waits for 2 integer and then adds them. For example I write:
add
a(2)
a(47)
(then I would get here the result.)
However I don't know, how to let the program count the number of inputs or how to let it declare and use variables.
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Apr 20, 2014
How to convert the equation below for bigDecimal objects. I have already tried this, and this and the output is really weird once I call the method. The first block of code is what I'm trying to convert into BigDecimal arithmetic.
public static double calculateFutureValue(double monthlyInvestment,
double monthlyInterestRate, int months) {
double futureValue = 0;
for (int i = 1; i <= months; i++) {
[Code] ....
My attempt at this is as follows:
public static BigDecimal calculateFutureValue(double monthlyInvestment,
double monthlyInterestRate, int months) {
BigDecimal futureValue = new BigDecimal(0.0);
BigDecimal montlyInvestmentDecimal = new BigDecimal(monthlyInvestment);
[Code] ....
Output:
Welcome to the Future Value Calculator
DATA ENTRY
Enter monthly investment: 1
Enter yearly interest rate: .01
Enter number of years: 3
Month: 1 FutureValue: 0E-66
Month: 2 FutureValue: 0E-132
Month: 3 FutureValue: 0E-198
Month: 4 FutureValue: 0E-264
Month: 5 FutureValue: 0E-330
[Code] ....
FORMATTED RESULTS
Monthly investment: $1.00
Yearly interest rate: 0.0%
Number of years: 3
Future value: 0E-2376
Continue? (y/n):
So clearly this still isn't working.
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Sep 17, 2014
I want to declare integers, while the program is running.
I run the program and then I give it via System.in.println an integer and repeat this as long as I want. I want the program to give those integers a name of a certain type for, for example a(i) or a[i], dunno, (it should be handy) and then a(i) represents the the i'th integer I gave the program. My idea is then that I can use those elements by their name just like, if I had declared them in the first place. For example add two integers together. For example I defined a method add+, which waits for 2 integer and then adds them. For example I write:
add
a(2)
a(47)
(then I would get here the result.)
I don't think implementing the add function is difficult. However I don't know, how to let the program count the number of inputs or how to let it declare and use variables.
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Jan 29, 2015
This first part of code is my HTML
<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
<meta charset="UTF-8">
<link href="jquery/jquery.mobile-1.4.5.min.css" rel="stylesheet" type="text/css"/>
<meta name="viewport" content="width=device-width, initial-scale=1">
[Code] .....
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Nov 14, 2014
class GVector {
// TODO: declare a private array to save the vector coordinates
// Creates a mathematical vector of d dimensions, initialized at 0
public GVector(int d) {
// TODO: implementation
[Code] ....
I'm confused with what type of array I need to use to save the vector coordinates and what to put in Gvector. Is it a constructor?
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Feb 1, 2014
Using exp4j which is a mathematical parser twice in one routine (or separated) in Eclipse and only the size2 is calculated when app is run in eclipse.
private void calculate size(){
String s1 = size.getText().toString();
String s2 = size2.getText().toString();
try {
Calculable result= new ExpressionBuilder(s1).build();
size1.setText(Double.toString(result.calculate())) ;
[Code] .....
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May 3, 2015
Here's my code:
System.out.println((3 / 1.5) + 42(3 + 3));
I don't understand what I'm doing wrong. I'm receiving these errors:
PrintFunction.java:8: error: ')' expected
System.out.println((3 / 1.5) + 42(3 + 3));
^
PrintFunction.java:8: error: not a statement
System.out.println((3 / 1.5) + 42(3 + 3));
^
PrintFunction.java:8: error: ';' expected
System.out.println((3 / 1.5) + 42(3 + 3));
I'm using Sublime Text and JDK 8.
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Feb 16, 2015
I need to write a Java program to perform a mathematical calculation between two numbers entered by the user. User has to choose the mathematical operation and input it and then when the user enters 2 numbers, he gets the answer. When user enters any other character other than *, /, + and - he should be able to exit. Perform calculation between numbers should be until user decided to exit from the program. My code is below, calculation part goes well, but can't get it exit when user enter any other character.. How to fix it?
import java.io.*;
public class q11
{
public static void main(String[]args)throws IOException
{
InputStreamReader ISR=new InputStreamReader(System.in);
BufferedReader BR=new BufferedReader(ISR);
while(true){
System.out.println("Enter..");
System.out.println("* : For multiplication");
[Code]...
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May 10, 2015
I am trying to write a java program that prints out the number that is the mathematical constant e. As you input a number, the larger it gets , the closer it comes to 2.71828 . Here is my code:
//taylor series that prints out e^1=1+1/1!+1/2!+1/3!+.....
import java.util.Scanner;
public class taylor_1
{
public static void main(String args[]) {
Scanner input=new Scanner(System.in);
int factorial =1;
[Code] .....
Here is the output of my code:
enter n
9
Taylor series is 9.0
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Oct 12, 2014
The program i am working on is to take string from the user which should be a phone number then it will return true or false based upon the method that checks to see if it meets the criteria of a certain format if does not it will return false otherwise return true. I am working on a if/else structure that will print this number is valid if it meets the criteria of the method i previously mentioned or return the number is not valid if it is false. the logic of the expression i put in the parentheses of the if/else statement. This is what i have so far:
if(){
System.out.println("The phone number is valid");
}
else {
System.out.println("This isn't a valid phone number");
}
Do i need to compare it based upon the method that checks if it is true?
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Feb 27, 2015
I have a math expression in a String, that I want to split into 4 pieces as in the following example:
String math = "23+4=27"
int num1 = (23 STORES HERE)
int num2 = (4 STORES HERE)
String operator = (+ STORES HERE)
int answer = (27 STORES HERE)
Note that the operator can be either + - * /
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Aug 25, 2014
I have to match pattern like 76XYYXXXX mean x can be 4or 5 and Y can be 6 or 7. All x and y should be same .i.e. 764664444
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May 4, 2015
package com.example;
import com.example.domain.Admin;
import com.example.domain.Director;
[Code]....
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Feb 3, 2015
I am working on a program to evaluate an expression without brackets using stacks. I am getting the following error :
3+1*2+4
-2.0
Exception in thread "main" java.util.EmptyStackException
at java.util.Stack.peek(Stack.java:102)
at java.util.Stack.pop(Stack.java:84)
at assignment2.Evaluate.main(Evaluate.java:42)
I imported the Stack from java.util.Stack
package assignment2;
import java.util.Scanner;
import java.util.Stack;
public class Evaluate {
public static void main(String[] args) {
Stack<String> ops = new Stack<String>();
[Code] ....
What is causing this error? Does it look like the program should function as intended?
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Apr 23, 2015
So everything in my program is working EXCEPT when it comes to calculating the result. I am supposed to evaluate the expression using postorder traversal to return the answer. I am honestly not sure how I would get the postorder traversal to return the answer to the expression since the only thing we really went over was how it re-ordered the expression so that it would end in the postorder/postfix order. Anyways, currently the way that I have the public int evaluate(Node node)method set up is giving me a result of 0, which obviously is not correct.
Here's the section that I'm having issues with:
public int evaluate(Node node){
if(node.isLeaf()){
return Integer.parseInt(node.value);
}
int result = 0;
int left = evaluate(node.left);
int right = evaluate(node.right);
[code]....
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Jul 30, 2014
How that's possible
import java.util.*;
public class Stars {
public static void main(String[] args) {
line (13);
line (7);
line (35);
System.out.println();
box(10,3);
[Code] ....
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