I am trying to make a calculator that ranges from simple math to trig. I am trying to start the j-frame for it and I already have most of the formulas programmed with the if-else statements and such. How do I go about starting the jFrame and marrying the 2 codes together to start it. (I have taken a bit of programming but relatively new to writing j-frames and using other classes and putting them together).
View RepliesI am attempting to make a heart rate calculator program. Here is a little overview of what I am trying to do. It must use a constructor and get and set methods. It must print heart rate ranges and the user's information(age).
// Use scanner to get inputs
import java.util.Scanner;
// Declare class
public class HeartRates {
private int Age;
private int DayOfBirth;
private int MonthOfBirth;
private int YearOfBirth;
private double MaxHeartRate;
private double MinTargetHeartRate;
[Code] ....
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.
For this I want to have simple boxes where a user can input numbers and I used complex calculations to return values (a lot of trigonometric functions etc.), the values then should have the opportunity to be altered to the users digression. This will create a solar model.
For the load aspect of it I am looking to have drop down boxes for a number of components which the user can select and will have a numerical value in Watts which will sum to give total load on system. Ideally I would like to show this graphically in a pie chart showing how much energy each component is taking to give the option to remove.
I am also creating a statistical model which determines the likelihood of having no sunlight on a given day which looks at the solar output, battery capacity and load on the system and will return reliability of the system - this has not been completed but should be shortly.
Aim is to keep web page as simple as possible as unskilled computer users may want to use it.
import javax.swing.JOptionPane;
public class Calculator {
public static void main ( String args[] ) {
double n1 = Double.parseDouble(JOptionPane.showInputDialog(" Enter first number: "));
double n2 = Double.parseDouble(JOptionPane.showInputDialog(" Enter second number: "));
String x = JOptionPane.showInputDialog("Enter operator: ");
double result;
[code].....
Write a program that mimics a calculator. The program will need to accept as input two numeric double values, and accept the operation to be performed as the third input. The operation to be performed will be input in the form of the character representing the java operator for the operation to be performed (i.e + for addition, - for subtraction, * for multiplication, / for division, or % for modulus). Once the program has read these 3 inputs it should output the numbers, the operator, and the result. (For division, if the denominator is zero, the program will output an appropriate message (i.e division by zero is an invalid operation). Please use the JOptionPane class for both accepting the required inputs and for the required output demonstrated below.Some sample output may look as follows:
3 + 4 = 7
13 * 5 = 65
10 / 3 = 3.33333333
Error Messages:
3 errors found:
File: /Users/gcaruso/Documents/CISS 110/Module 3/Module 4/Calculator.java [line: 23]
Error: /Users/gcaruso/Documents/CISS 110/Module 3/Module 4/Calculator.java:23: 'else' without 'if'
File: /Users/gcaruso/Documents/CISS 110/Module 3/Module 4/Calculator.java [line: 31]
Error: /Users/gcaruso/Documents/CISS 110/Module 3/Module 4/Calculator.java:31: 'else' without 'if'
File: /Users/gcaruso/Documents/CISS 110/Module 3/Module 4/Calculator.java [line: 37]
Error: /Users/gcaruso/Documents/CISS 110/Module 3/Module 4/Calculator.java:37: 'else' without 'if
Started java a couple days ago, and now im working on a calculator. But i'm having a problem with else-if statement. I've made a simple version of the problem here so its easier to identify. If i type in 17, it will give me the answer that i want it to. But if i type in 38, nothing happens.
Java Code:
import static java.lang.System.out;
import java.util.Scanner;
public class Firstclass {
public static void main(String[] args) {
Scanner answer = new Scanner(System.in);
out.println("Whats your name?");
if (answer.nextLine().equals("bob")) {
out.println("How old are you?:");
if (answer.nextLine().equals("17")) {
out.println("Nice");
} else if (answer.nextLine().equals("38")) {
out.println("good");
}
}
}
} mh_sh_highlight_all('java');
i am working on my assignment in Compro 2, we are ask to make a simple calculator program
here's my code;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JFrame;
import java.awt.BorderLayout;
[code]...
I am a beginner with Java. I have never used SWING before but I have to use it now and I am clueless. I don't know if what I am doing is right.I need to create a simple calculator. My problem is getting the buttons the user clicks to appear in a text field. I know I haven't added the =/*- buttons yet.
I have left actionPerformed practically blank, what to put in ?
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
/**
* Created by IntelliJ IDEA.
* Date: 11/12/2014
* Changing Face Program.
*/
public class Calc extends JFrame implements ActionListener
[code]...
Here's the lab assignment: This program is a simple "printing" calculator. It will accept input from the user in the following form:
number operator
The number entered will be expected to be a float type.
The operator will be expected to be one of the following:
'E' or 'e' - Enter the number into the accumulator (this will destroy the current value). This operator is used to set the accumulator to a known value.
'A' or 'a' - Add the number to the current value in the accumulator
'S' or 's' - Subtract the number from the current value in the accumulator
'M' or 'm' - Multiply the number times the current value in the accumulator
'D' or 'd' - Divide the current value in the accumulator by the number (do not divide the accumulator by zero)
'P' or 'p' - Raise the current value in the accumulator to the power of the number, for this problem truncate the number to its integer value. (negative numbers will not be allowed) SDo not use the "Math.pow()" method to solve this problem.
'T' or 't' - Terminate processing and print the final result. The number accompanying this operator should be ignored.
The 't' or 'T' stop signal is entered by the user, the program will print out the final value contained in the accumulator and terminate.
A sample session would be the following:
User inputs: Calculator outputs:
10.0 e = 10.0000
2 D = 5.0000
2 P = 25.0000
55.0 s = -30.0000
100.25 E = 100.2500
4 m = 401.0000
0 t = 401.0000
When the program starts the initial value for the accumulator is set to zero.
If the user gives an input that would result in an error if the operation were to be attempted, an error message is printed and the current accumulator value. This calculator handles three types of input errors:
1). if the user enters an invalid operator, the message is printed : an invalid operator was entered - please reenter
2). if the user attempts to cause a divide by zero, the message is printed : attempt to divide by zero - please reenter
3). if the user attempts to raise the accumulator to a negative power, the message is printed: negative powers are not allowed - please reenter
By looking at the requirements, here's how I would like to setup the program if I knew the proper syntax and all:
Step 1: Create Class called 'calculatorProgram'
Step 2: Use code that will allow UserInput after program executes (Our teacher forbids us to use Scanner, wants us to use InputStreamReader and BufferedReader)
Step 3: Create Variables:
*Fnum (It will be the Accumulating number)
*Ans (displayed after Fnum + operator)
*Operators: E, A, S, M, D, P, T (define their functions)
Step 4: -Tell user: "How to use the calculator and what letters to use for their function"
-Ask user to: "enter a number and an Operator function"
Step 5: Begin with a While loop( != 'T' || != 't'){} -I think that's how the loop should be formatted
Step 6: Design proper If/else and nested If/else statements for each operator and its function, be sure to use nested if/else for invalid operators, divide by 0, and using negative powers.
Assuming I knew how to write Java this is how I would want to code my program. I understand the concept or I/O and the purpose of Conditional statements just I have a hard time knowing how to place the variables in the right places and writing proper syntax.
I need to do a simple while loop pay calculator. I am very new and not sure what I need to do to put all the requirements in the new code from another code. Here is my code that doesn't work yet.
1.Place the wage calculation routines in a while loop.
2.Allow the user to input an individual's hours worked.
3.Accumulate the total regular hours worked, the overtime hours worked, the amount of the regular pay, the amount of overtime pay, and the total payroll, for all of the employees entered.
4.Allow the user to enter a zero (0) as the Boolean expression to end the loop.
5.When the loop ends print out all of the accumulated totals with appropriate labels, each on a separate line.
import java.util.Scanner;
public class WhileLoopPayCalc
{
public static void main(String [] args) {
final double REGULAR_HOURS = 40f;
final double HOURLY_WAGE = 12.5f;
final double OVERTIME = 1.5f;
double wage = 0f;
[Code] ....
How can i write a java program that simulate a simple calculator that performs the basic arithmetic operations of JAVA. (JOption Pane and Repeat control structure)
Example : Addition, Subtraction, Multiplication, Division.
The program will prompt to input two floating point numbers and a character that represents the operations presented above. In the event that the operator input is valid, prompt the user to input the operator again.
Sample Output :
First number 7
Second number 4
Menu
<+> Addition
<-> Subtraction
<*> Multiplication
</> Division
Enter Choice: * <enter>
The answer is 28.
My professor like us to make a salary, taxes and etc exercise. which we should type the name first then, input salary. then if we input the amount 8000 or higher. the system will ask another question about the marital status. and that is it.
My real problem is when we input 5000-7999 the system should ask a different question, stating do you want to pay for your premiums and a follow up of yes and no choices. if we input 0-4999 the system will just state that it is your current salary.... etc..
package exer5;
import java.util.Scanner;
public class Exer5 {
public static void main(String[] args) {
Scanner Kirk = new Scanner (System.in);
[code]....
I am comparing date with following requirement the value date transaction must be within the Active date(>= greater than or equal) and inactive date(<= less than) date range,my problem is date is showing up in two different ranges with the results of that am getting two error message ....
lets say the date is:
transdate=2014-05-16
activedate=24/APR/14
inactivedate=25/APR/14
s
My code is :
try {
String s_ActivDate = getValueFromTable("S", "EXCEPTION_NAME", "EXCEPTION_NAME", s_exceptionName, "EXCEPTION_NAME_DATE_ACTIVE");
String s_InactiveDate = getValueFromTable("S", "EXCEPTION_NAME", "EXCEPTION_NAME", s_exceptionName, "EXCEPTION_NAME_DATE_INACTIVE");
System.out.println("Systemoutdateafer "+sDate);
[Code] ....
i have to ask user gross sales until -1 sentinial and to get the commission to put in groups its 9% times the sales add $200
the groups are formatted
a) $200-299
/> $300-399
....
i) $1000 and over
import java.util.Scanner;
public class Commissions {
/**
* @param args
[Code]....
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] ....
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 + - * /
Here is the assignment:
Prompt the user to input two sides (a and b) of a right triangle. Calculate, using the
formulas below, the hypotenuse and the other two angles of the triangle. Calculate the
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.
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] ...
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.
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.
I am trying to complete an assignment and I am stuck on a key point. I must print the total inventory value across each of these arrays, as it prints for each "list". To do this, I understand that I need some form of correlation between my variables "total" and "Price" between each array. My quandary lies in the way that I have designed this code to begin with. I am not sure where to add the math section of code that is needed, nor am I fluent enough with Java to know how to call all of the arrays as it prints. Listed below is my code, when you compile it the total inventory value is 0 for each "list".
package inventory;
public class Inventory {
public static void
main (String[] args) {
List[]list = new List[5];
[code]...
building a game. the game is all about the multiple times table with levels. easy medium and difficulty. I dont even know where to begin and what is the codes to use or even the platform. what websites can be access etc and what is the big deal with code tags.
View Replies View RelatedI'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].....
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) ???
View Replies View RelatedThis 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] ....
I am doing this math for my assignment where you have to find the imaginary number.
double dem = (b*b-4*a*c)*-1;
double dem2 = Math.sqrt(dem);
realPart = (-b/(2*a));
imagine = (dem2)/(2*a);
imagineneg = (dem2)/(2*a);
So basically I am trying to get it that the number inside the square root isnt negative. So lets say I enter a: 1, b: -1, c: 4.25. When you do the discriminant it would be -16 but I want that to be positive so I multiple it by -1 (thats the dem part). Then I sqaure root the whatever the answer is and then go to the imagine and imagineneg part where you find the imaginary number.
My problem is that instead of it being -16*-1 to get 16, some how I get 15.
So my little math game is working so far. I can only do addition though. I know how to fix it if I can find out how to generate random math operators. After that I want to use a loop (or a better technique) to ask ten different math questions before the game is over.
package pkgnew;
import java.util.Scanner;
import java.util.Random;
public class New {
public static void main(String args[]) {
//Declare and construct variables
Random randomnum = new Random();
[code].....