Split A Math Expression?

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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Java Math - Write Expression Whose Value Is Length Of Diagonal Of Square

Jul 24, 2014

The area of a square is stored in a double variable named area . Write an expression whose value is length of the diagonal of the square. Do I use math.sqrt?

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How To Split A Text Looking For Values With Regular Expression

Aug 6, 2014

I have to read a text looking for value related to certain variable. The variable are always DE plus identifier from 1 to 99 or DE plus identifier from 1 to 99 and SF plus identifier from 1 to 99. The value can be alphanumeric. How can I get these values? As a start point, I try to use split("DE") but I can get something that is wrong if there is "DE" inside the text that doesn't me interest. I look for scanner but it doesn't work. I guess that there is some way, maybe using regex but I am completely lost ( I have never used regedix before and I am in rush to fix this).

Basically, the text is similar to the below where DE means data element and sf sub field. Some data elements have sub fields while others don't. I guess that there is a way to split with something like DE+anyNumberFrom1To99 = theValueAimed in some array and DE+anyNumberFrom1To99+,+SF+anyNumberFrom1To99 = theValueAimed in other array.

DE 2, SF 1 = 00 SOME TEXT THAT DOESN'T INTEREST ME
DE 22, SF 1 = 0 SOME TEXT THAT DOESN'T INTEREST ME
DE 22, SF 4 = 1 SOME TEXT THAT DOESN'T INTEREST ME
DE 22, SF 5 = 0 SOME TEXT THAT DOESN'T INTEREST ME
DE 22, SF 6 = 11 SOME TEXT THAT DOESN'T INTEREST ME
DE 22, SF 7 = 90x SOME TEXT THAT DOESN'T INTEREST ME
DE 22, SF 7 = 12ab SOME TEXT THAT DOESN'T INTEREST ME
DE 99 = 1234 SOME TEXT THAT DOESN'T INTEREST ME

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Specific Regular Expression - Split A String

Mar 3, 2014

Regular expression which I want to use to split a string. The string could look similar to this:

"a = "Hello World" b = "Some other String" c = "test""

The String is read from a file where the file contents would be:

a = "Hello World" b = "Some other String" c = "test"

After splitting I would like to get the following array:

String[] splitString = new String[] {"a", "=", ""Hello World"", "b", "=", ""Some other String"", "c", "=", ""test""}

I know I could just write a simple text parser to go over the string character by character, but I would rather not do it to keep my code clean and simple. No need to reinvent the wheel.

However, I just cant seem to be able to find the right regular expression for this task. I know that a RE must exist because this can be solved by a finite automaton.

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I'm trying to calculate sin(x) without using Math.sin(x). The formula for sin(x) is: x - x^3/3! + x^5/5! ... I can't seem to get the coding for the alternating +/- right. Here's my program:

import java.util.Scanner;
import java.lang.Math;
class Sin
{
public static void main(String[] args)
{
Scanner kb = new Scanner(System.in);
int n, c, fact = 1, count = 1;
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[Code] ....

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Here is the assignment:

Prompt the user to input two sides (a and b) of a right triangle. Calculate, using the

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perimeter and the area.

Here are the formulas:

a^2 + b^2 = h^2

sinθ = a/h

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how to start this program out, i know which math classes i need to use.

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Sep 14, 2014

Given a string of numbers and operator. Compute as follows:

Consider, "000293000002030403+0400293059694" is the input.

a. Separate the two operands and one operator:
"000293000002030403" "+" "0400293059694"

b. On each string operand, take each digit. ADD them all.
(2+9+3+2+3+4+3) + (4+2+9+3+5+9+6+9+4)
The two string operands should now become two integers.

c. Lastly, perform the operation using the string operator specified on the original string.
26 + 51 = 77

I don't know why I get the sum of 52 when I use a for loop.

Here are my codes:

public class string2math {
public static void main(String[] args) {
String input = "000293000002030403+0400293059694";
String [] operand = input.split("+");
String firstOpera = operand[0];

[Code] ...

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Feb 22, 2014

package statics;
public class Test_main {
public static void main(String[] args) {
Math.log(50.00);
}
}

I am able to use a Math method without importing the java.lang.Math. Which makes me think

1) What is the use of the import statement in java?
2) Is my IDE taking care of the import automatically?

I am using Eclipse IDE and JDK 1.7.

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Oct 14, 2014

I'm having extreme troubles with my outputs not displaying the correct math. I have everything organized how I want it, it's just not giving me the correct answers.

The code is supposed prompt the user to enter an investment amount and an interest rate and display the future investment amount for years 1-30. The formula for this is:

futureInvestmentAmount = investmentAmount * (1 + monthlyInterestRate)^(numberOfYears*12)

Here is my code:

import java.util.Scanner;
public class InvestmentValue {
public static void main(String[] args) {
  // prompt user to enter data
Scanner scan = new Scanner(System.in);
System.out.println("The amount invested: ");

[Code] ....

And I have to use a method to do this as it is what we are learning in class right now. A sample output as of now is:

The amount invested:
1000
Annual interest rate:
9
Years Future Value
11.0E15
21.0E27

[Code] .....

And obviously a future investment amount cannot equal infinity.

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package inventory;
public class Inventory {
public static void
main (String[] args) {
List[]list = new List[5];

[code]...

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import java.util.Scanner;
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public static void main(String[] args){
Scanner s = new Scanner(System.in);

[Code].....

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This program is supposed to ask for the operator (+ or -) then ask you for two numbers and do the math. When I run it it comes up- Enter operator. When I say add or sub nothing happens. Here it is:

import java.util.Scanner;
public class Echo1{
public static void main(String args[]){
Scanner userInput = new Scanner(System.in);
System.out.println("Enter Operator");
String operator = userInput.next();

[Code] ....

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Feb 4, 2015

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I am doing this math for my assignment where you have to find the imaginary number.

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package pkgnew;
 import java.util.Scanner;
import java.util.Random; 
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  public static void main(String args[]) {
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[code].....

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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
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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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package coba;
import java.util.Scanner;
public class Coba {

public static void main(String[] args) {
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[Code] ....

but when i run it the error code show like this : Quote

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Java Code:

Vector3f A = new Vector3f(0, 0, -1);
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Vector3f v1 = new Vector3f(B.x - A.x, B.y - A.y, B.z - A.z);
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float[] j = new float[]{v1.y, v2.y};
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[Code] ....

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import static java.lang.Math.*;
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5

9

0

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I have a string that look like this

"dfhsdfhds | dsfdsfdsfd dsfjkhdskjf ||ER|| jdkshfuiewryuiwfhdsfsd er dsfjsgrwhfjkds ||ER|| jkshruiewryhijdknfjksdfhdksg | "

I want to split it by "||ER||"

I try this but it splits the single "|" to not just the "||ER||" like I want.

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