String To Math Operation
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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Nov 17, 2014
I am trying to write a program which asks the user to enter two numbers and then do the arithmetic operation based on user's input . No compiling errors but when I run the program I keep getting "StringIndexOutOfBounds" error .
class arithmetic {
public static void main(String[] args){
Scanner in = new Scanner(System.in);
int ent1 = 0;
[Code]....
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May 6, 2014
I have to write a java programm,where i have given string. Output should be like that:
1. print only once what characters are apearinng in string, and the last index of it
2. print how many characters are in the string
I have to do it only with loops,no special classes
So far:
public static void main( String[] args ) {
String besedilo = "Testiranje";
besedilo = besedilo.toLowerCase();
for (int i=0; i<besedilo.length();i++)
[code]...
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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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Feb 8, 2015
When addition operation is performed on the character variables ,then it specifies actually that the ASCII values are added because the character variable stores ASCII value of the character constant ,then why after the addition the result cannot be stored inside a character variable ,why it needs to be stored in an integer variable only ,when actually the character variable stores the ASCII value then why is it an error to store the added result in an character variable.
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Mar 4, 2011
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System.Exit (0)
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Nov 13, 2014
*Write a program to simulate this airport's operation. You might assume a simulated clock that advances in one-minute intervals. For each minute, generate two random numbers: If the first in less than LandingTime /60, a "landing arrival" has occurred and is added to the landing queue, and if the second is less than TakeOffTime /60, a "takeoff arrival" has occurred and is added to the takeoff queue*.
*Next, check whether the runway is free. If it is, first check whether the landing queue is nonempty, and if so, allow the first plane to land; otherwise, consider the takeoff queue. Have the program calculate the average queue length and the average time that an airplane spends in a queue.*
I have most of the code done as you can see below:
* Queue Interface: Queue.java
* Queue Implementation: ArrayQueue.java
* Demo Program: Airport.java
Right now, I am stuck on the first calculation which is trying to figure out the average size of the landing queue. For some reason, as you can see at the bottom of my demo program, the average always comes out to be 0.0 and I'm not sure what's wrong.
Secondly, how to calculate the average time a plane stays inside a queue for. Write a program to simulate this airport's operation. You might assume a simulated clock that advances in one-minute intervals. For each minute, generate two random numbers: If the first in less than LandingTime /60, a "landing arrival" has occurred and is added to the landing queue, and if the second is less than TakeOffTime /60, a "takeoff arrival" has occurred and is added to the takeoff queue.
Next, check whether the runway is free. If it is, first check whether the landing queue is nonempty, and if so, allow the first plane to land; otherwise, consider the takeoff queue. Have the program calculate the average queue length and the average time that an airplane spends in a queue.
I have most of the code done as you can see below:
* Queue Interface: Queue.java
* Queue Implementation: ArrayQueue.java
* Demo Program: Airport.java
Right now, I am stuck on the first calculation which is trying to figure out the average size of the landing queue. For some reason, as you can see at the bottom of my demo program, the average always comes out to be 0.0 and I'm not sure what's wrong.
Secondly, how to calculate the average time a plane stays inside a queue for.
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Sep 14, 2014
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;
double x, sum = 0, sum_sin = 0, result;
[Code] ....
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Feb 2, 2014
I am currently learning recursion, and i have a query. I have a program that receives user input, and outputs the decimal input into binary form. In my recursive function, I have a if else loop to check if operation is completed.
public static int Converter(int input, int weight) {
System.out.printf("Input is now %d, weight is now %d
",input,weight);
if(input==0) {
return 0;
[Code] .....
The final return, when input finally hits zero is concatenating 0 to whatever i have this far. e.g. Decimal 10 should give 1010, but because of the "return 0", instead of getting 1010+0, i am getting 10100.
I can solve the problem by creating a variable sum,and passing along, but i am just curious why the final return 0 is giving me not a +0, but a concatenate 0.
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Sep 18, 2014
I am able to perform column operation but not able to perform row operation because i am not able to store data say a 2 matrix [][]. I need to store the data into a 2-D matrix. Here is my code:
Java Code:
import java.awt.List;
import java.io.BufferedReader;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.Scanner;
public class colRowRead {
[Code] ....
I tried something like that:
for(int i=0; i<rows; i++) {
for(int j=0; j<cols; j++){
matrix [i][j]=textFile.get(i).split(" ");
//System.out.println(matrix[i][j]);
}
}
*/ mh_sh_highlight_all('java');
File col.txt is like this:
Java Code:
5 9 7 1 5
3 6 8 6 8
4 6 7 8 9
9 8 3 5 7 mh_sh_highlight_all('java');
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Apr 26, 2015
Write a program to simulate the operation of a simple robot. The robot moves in four directions: Forward, backwawrd, left, and right. The job of the robot is to move items and place it in the right slots in each station. There are 8 stations plus the pickup station. Pick up station is the initial start where the robot picks the items. 8 items can be placed on each station. The nearest station must be filled before placing items on the next station. The items are marked with identification or serial numbers. The items with odd serial number go to the right and items with even number go to the eft. The last slot, number 7 is reserved for light items which are less than 80kg. The serial number is a five digit number, the MSB digit 5 indicates that the product must be placed in the fifth station which is keeping the product at 20 degree F.
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Sep 30, 2014
I have now slowly moving on the learning Database Connectivity.Found a simple example on one site and tried to execute it, Creating a database, connecting to it and displaying the output.
I am getting trouble with recordset in displaying all the records in the badabase. It displays the very first record correctly but if I try to enclose it in while(rs.next()) loop, it generates an error message saying "Invalid operation at current cursor position".
package database_console;
import java.sql.Statement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.ResultSet;
[code]....
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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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Sep 18, 2014
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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
A + B + C = 180 degrees
how to start this program out, i know which math classes i need to use.
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Feb 22, 2014
package statics;
public class Test_main {
public static void main(String[] args) {
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}
}
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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May 16, 2014
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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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Feb 14, 2014
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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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Nov 23, 2014
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Jan 20, 2015
I'm trying to convert a Formula to run in a java program.
This is the formula:
(you can ignore the modifier part)
This is my attempt. However it prints out 0.0
import java.util.Scanner;
public class DamageCalc{
public static void main(String[] args){
Scanner s = new Scanner(System.in);
[Code].....
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Sep 1, 2014
i am trying to calculate the number of months it takes to pay off a set amount of credit card debt given the following information: principle amount, annual interest rate, and monthly payment. How to import the formula necessary to system.out.print the answer (number of months it takes to pay off debt) ???
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Feb 17, 2015
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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May 5, 2014
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Dec 9, 2011
I am somewhat of a java newbie (learned it awhile back and just getting back to programming some again.) I have a text file of data much larger than this, but here are the first ten rows and first 10 columns.
39755320111041730140.633038085-2.117082366149.069997
39850320111041730150.633038085-2.117082511148.309997
39955320111041730160.633037998-2.117082293149.509997
40055320111041730170.633037945-2.117082351149.239997
.......
I can read and write all the data back out to files. But I am not sure about a few things.
First would it be best to use BufferedReader and OutputStream such as:
public static void main(String[] args) throws IOException {
BufferedReader bReader = new BufferedReader(new FileReader ("testdata.txt"));
BufferedOutputStream bytesOut = new BufferedOutputStream(new FileOutputStream ("outfile.txt"));
Second, I was then going to initialize an array but I might have 30 or more columns of data, of which I might perform and output only 10 columns to my output.txt file so is this a good way?
Third, I only want to perform operations (such as average the data, convert units or multiply two columns together) on 10 of the 30 plus columns and print out results to output.txt file. For example, In testdata.txt file above, I want to skip first seven columns. I then want to take column 8 and multiply by 100 then divide by 3 and output result to output file. I want to do same for column 9. Column 10 I want to multiply by different number (by 3.5).
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Mar 4, 2014
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public final int Add(int a,int b) {
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}
class B
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public static void main (String args[])
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}
}
This is what I have. I'm not sure if this even makes use of a final method. But when I run it I get an error saying cannot find symbol for line 13.
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Feb 4, 2015
I am a 3rd year electrical engineer and I am working on a project on solar cell design in the developing world.For my project I am looking to create a very simple web page which can be used by people in the developing world to determine whether a photo voltaic system is suitable to their needs.
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