User Input 3 Sides - Output Invalid If Does Not Make A Triangle
Nov 4, 2014
I had to make a program that allows the user to enter 3 sides and it should output "invalid" if it does not make a triangle and if it does make a triangle it calculates the area of the triangle and it doesnt seem to do anything but say "invalid" as the out put.
import java.util.Scanner;
public class MyTriangle {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
boolean valid = true;
double side1, side2, side3, area, A;
My program is supposed to include The three sides of the triangle formatted to two decimal places The perimeter formatted to one decimal place The area formatted to one decimal place The unformatted area. It does run, but it is not decimal formatted. I have read my book to try and figure out how to do this, but it doesn't make since to me.
I'm using one method to take input from the user and append some text to it, then I am trying to return the value of the variable and use another method to print it out. But for some reason whenever I try doing this I can't print out anything and I only get a "null" output. Why this is happening?
package Homework3; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class Homework3 {
Using JOptionPane,ask for 10 numbers from the user.Use an array to store the values of these 10 numbers.Output on the screen the number with the greatest value.
import java.util.Scanner; public class Practice { public static void main(String[] args) { //get user input Scanner user_input = new Scanner(System.in); System.out.print("Enter a number: " );
Write a program that prompts the user to input an integer and then outputs both the individual digits of the number and the sum of the digits.
Now I have a code for spacing out the integers, and I have a separate code for adding the digits. But I am not sure how to merge them together. Both of them work independently
Spacing code: import java.util.*; public class SumoftheIntegers { static Scanner console=new Scanner(System.in); public static void main(String []args) { int num1, test, rem; int counter = 0;
[Code]...
Now the sum of the integers code:
import java.util.Scanner; public class sum { public static void main(String[] args) { // Create a Scanner Scanner input = new Scanner(System.in); // Enter amount System.out.print("Enter an integer: "); int integer = input.nextInt();
I have a project requiring me to build a program having a user input 3 words, sort them alphabetically and output the middle word. I have done some searching and seem to only come back with results for sorting 2 words. I so far have code to get the user input but I am completely lost as to how to sort them alphabetically.
import java.util.Scanner; //The Scanner is in the java.util package. public class MiddleString { public static void main(String [] args){ Scanner input = new Scanner(System.in); //Create a Scanner object. String str1, str2, str3; System.out.println("Please enter three word words : "); //Prompt user to enter the three words
[Code]...
we havnt done arrays yet and I THINK i have to do compareTo.....how to use it?
I have a FractalGUI and a FractalTriangle class. The FractalTriangle class is what does a lot of the work, it uses ATriangle(s) to make a triangle, and it uses recursion to draw three children triangles along each parent triangle. Fractal Triangle has a method "makeTriangle" private ATriangle makeTriangle( Point p0, Point p1 ) which takes the ATriangles and sets them the right size and everything, but for some reason I can only get one level of children triangles, and they are also already their upon running which they shouldn't be, they should appear when the depth is 2. When the depth is three it should add three triangles each onto the three added at depth two. At depth 4 it should add three each onto the three previously made triangles, and so on until depth reaches 6, the max depth. Here is some code of my FractalTriangle.
The Atriangle class given to us ("starter code") does not extend or implement anything, and has basic methods (setLocation, setSize, setThickness, setColor, etc. )
//---------------- class variables ------------------------------ //---- recursive generation parameters public static double sizeRatio = 0.5; // integer represent % public static double offset = 0.5; // offset/100 = parametric value // child positioning offset public static double p2projection = 0.5; // parametric value of projection of // vertex p2 onto the base; can be < 0 public static boolean outside = true;
[code]....
the way it looks without the recursion looks much more right, but I am supposed to have recursion in that constructor but I can't figure out how to get it right with the recursion. It's so weird how with the recursion the big red triangle ( base triangle ) disappears, and you can see the children are really really small.
I've been working on a question using parallel arrays where the user inputs an integer 1-12 and the output will be the name of the month and the number of days in that month. This is what I have so far
import java.util.*; public class DaysMonth { public static void main (String args[]) { Scanner keyIn = new Scanner(System.in); int[] days = new int[]{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
import java.io.*; public class MagicSquare { public static void main(String[]args)throws IOException { BufferedReader in=new BufferedReader (new InputStreamReader(System.in)); System.out.print("Enter a Magic Number: "); int number=Integer.parseInt(in.readLine());
[Code] ....
//where should i enter a even number that will be outputted "invalid" //and it only should accept odd numbers
I am trying to write a program that will generate a QR Code from an input text and also display some information about the input/output bits. So far I have created the frame and what to do next. And I'm not sure if I am on the right track since my level of programming is not that great. By the way, I am using zxing libraries from GitHub. I know, there are plenty of generators online for the QR Code, but that is not what I am looking for. As you can see on the attached image, I am more interested in the efficiency of encoding 2D data. Also, I noticed that almost all the online projects regarding 2D codes are for Android. Which is not very useful.
I'm doing a problem where the area of a triangle is returned (if valid). However, I want to return a message (i.e. 'triangle is not valid) if the triangle is invalid.
I'm not sure how to go about to doing this as my method (called area) will only let me return doubles. Possible to return a string in an else within my area method?
public class MyTriangle { public static void main(String[] args) { //triangle is valid if the sum of any two sides is bigger than the third System.out.println(isValid(3, 4, 5)); System.out.println(area(543, 4, 5));
Basically I need to make a program prompts the user for an integer, check to make sure the length entered by the user is a power of 2 and at least 2. Then I need to convert from base e to base 2 then I need to print the tick marks of a ruler based of the value of the length.
I got the whole converting thing working and the check for a power of 2, that wasn't an issue because it didn't require any recursion. I just don't know how to print out the proper tick mark values.
The way it is supposed to work is that it needs to look like this. Say the user enters 8;
012131210 012345678
Or if the user enters 16;
01213121412131210 01234567890123456
The bottom row is pretty much just the index value, that I print fine.
The top row though is supposed to be the length of the ticks on a ruler, with the middle most value being the value of the conversion from base e to base 2 from above. I can get that printed and what I get just looks like this.
For 8;
000030000 012345678
For 16;
00000000400000000 01234567890123456
As you can see I can get the middle value and the index values below but I don't know how to use recursion to get the right numbers.
Here's my current code.
import java.util.*; public class TickMarks { public static void main (String args[]){ Scanner input = new Scanner(System.in); boolean looping = true; while(looping == true){ System.out.print("Please enter a length: ");
[Code]...
Now the methods isPowerOfTwo() and printLength() both work fine. However, I'm not sure how to get the left and right side working.
My thoughts were to split the length in half and get a left and right side. I gave both of them arrays so I can keep track of the values. Now as you've seen above I get all zeros and I know it's because that's the default value in an array, I just don't know how to get the proper values.
I am writing a code that requires a user to input a number, then output the individual digits and then add the sum of the digits. I have the entire program written, but I cannot figure out how to make zeros output as individual digits. If I input 400, it only shows 4 and not 4 0 0. Here is the code:
import java.util.*; public class week4program { public static void main(String[] args) {
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".
I have been struggling with this program for weeks. This program is supposed to take a user's inputted odd number and then print out all prime numbers lower than that number.
public class PrimeNumber { Scanner scan = new Scanner(System.in); int userNum; String neg;
How do I put this code in a way that it works because I know it is probably something obvious but I cant find how to make the array readable without error. It is supposed to intake two values and output what day of the week it is.
Testing Program
Initial day: Monday Next day: Tuesday Next day again: Wednesday Previous day: Tuesday Next week: Tuesday Add 4 days from initial day: Friday
I had to make a chart where it took miles 1-10 and convert it to kilometers and then on the other side it needs to show 25-65 (in 5's) kilometers to miles and I dont know how to switch the sides...
import java.util.Scanner; public class MilesAndKilos { public static void main(String[] args) { int miles; double kilometers=1.60934; System.out.println(" Miles Kilometers Kilometers Miles"); for(miles=1;miles<10;miles++){ kilometers = miles * 1.60934; System.out.printf(" %2d %8.3f | ", miles,kilometers); } }//end of main method }
class Client{ public static void main(String []args){ Bike R1=new Bike(5.0, 60.0,30.0);//create bike object with params Bike R2=new Bike();//without params System.out.println(R1.increaseSpeed());//calling methods System.out.println(R1.maxDistance()); System.out.println(R2.increaseSpeed()); System.out.println(R2.maxDistance()); } }
I have this really a graphics program that I'm working on which displays a single die, and right now it is set to the default 6 sides. I need to change it to 12. Here is the program:
How would I display certain output text if the text entered equaled "text".
So lets say you enter a question into a JTextField. You press a button that submits the text. The output displayed depends on what the question you asked was.
Think about it as "If question = What color is the sky? On submit, display text "Blue". How to implement this.
