Please help me figure out what I am doing wrong.... =[ 2.20 Debugging: Painting

ID: 3781191 • Letter: P

Question

Please help me figure out what I am doing wrong.... =[

2.20 Debugging: Painting a wall (Java)

Instructor notes

(1) Prompt the user to input a wall's height and width. Calculate and output the wall's area. (Submit for 2 points).

(2) Extend to also calculate and output the amount of paint in gallons needed to paint the wall. Assume a gallon of paint covers 350 square feet. Store this value using a const double variable. (Submit for 1 points, so 3 points total).

(3) Extend to also calculate and output the number of 1 gallon cans needed to paint the wall. Hint: Use a math function to round up to the nearest gallon. (Submit for 2 points, so 5 points total).

1. Compare output

0/2

12 15

Exception in thread "main" java.lang.NoClassDefFoundError: PaintEstimator (wrong name: paintestimator/PaintEstimator) at java.lang.ClassLoader.defineClass1(

Enter wall height (feet): Enter wall width (feet): Wall area: 180.0 square feet

2. Compare output

0/1

12 15

Enter wall height (feet): Enter wall width (feet): Wall area: 180.0 square feet Paint needed: 0.5142857142857142 gallons

3. Compare output

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12 15

Exception in thread "main" java.lang.NoClassDefFoundError: PaintEstimator (wrong name: paintestimator/PaintEstimator) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:803) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:442) at java.net.URLClassLoader.access$100(URLClassLoader.java:64) at java.net.URLClassLoader$1.run(URLClassLoader.java:354) at java.net.URLClassLoader$1.run(URLClassLoader.java:348) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:347) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)

Enter wall height (feet): Enter wall width (feet): Wall area: 180.0 square feet Paint needed: 0.5142857142857142 gallons Cans needed: 1 can(s)

4. Compare output

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20 50

Enter wall height (feet): Enter wall width (feet): Wall area: 1000.0 square feet Paint needed: 2.857142857142857 gallons Cans needed: 3 can(s)

code I am using...

import java.util.Scanner;
import java.lang.Math; // Note: Needed for math functions
public class PaintEstimator {

public static void main(String[] args) {

//Scanner class object is used to read the inputs entered by the user
Scanner scnr=new Scanner(System.in);

//Declaring variables
double height,width,area,paint_needed;


//Declaring constant
final double>

//Getting the height entered by the user
System.out.print("Enter wall height (feet):");
height=scnr.nextDouble();


//Getting the width entered by the user
System.out.print("Enter wall width (feet):");
width=scnr.nextDouble();


//calculating the area of the wall
area=width*height;


//1.Displaying the area of the wall
System.out.println("Wall area: "+area+" square feet");


//calculating the paint need to paint the area of the wall (In gallons)
paint_needed=area/one_gallon_covers;


//2.Displaying the no of gallons of paint needed to paint the wall
System.out.println("Paint needed: "+paint_needed+" gallons");


//3.Rounding the required gallons of paint to paint the wall
System.out.println("Cans needed: "+Math.round(paint_needed)+" can(s)");

return;
}
}

1. Compare output

0/2

Input

12 15

Your output starts with

Exception in thread "main" java.lang.NoClassDefFoundError: PaintEstimator (wrong name: paintestimator/PaintEstimator) at java.lang.ClassLoader.defineClass1(

Expected output starts with

Enter wall height (feet): Enter wall width (feet): Wall area: 180.0 square feet

2. Compare output

0/1

Input

12 15

Your output starts with

Expected output starts with

Enter wall height (feet): Enter wall width (feet): Wall area: 180.0 square feet Paint needed: 0.5142857142857142 gallons

3. Compare output

0/1

Input

12 15

Your output

Expected output

Enter wall height (feet): Enter wall width (feet): Wall area: 180.0 square feet Paint needed: 0.5142857142857142 gallons Cans needed: 1 can(s)

4. Compare output

0/1

Input

20 50

Your output

Expected output

Enter wall height (feet): Enter wall width (feet): Wall area: 1000.0 square feet Paint needed: 2.857142857142857 gallons Cans needed: 3 can(s)

code I am using...

import java.util.Scanner;
import java.lang.Math; // Note: Needed for math functions
public class PaintEstimator {

return;
}
}

Explanation / Answer

Problem here is System.out.print is not givin you console back to type in your input.

Declare Scanner after System.out.print or use System.out.print

Here is the code

import java.util.Scanner;
import java.lang.Math; // Note: Needed for math functions

public class HelloWorld{
public static void main(String[] args) {

//Declaring variables
double height,width,area,paint_needed;


//Declaring constant
final double>

//Getting the height entered by the user
System.out.print("Enter wall height (feet):");
//Scanner class object is used to read the inputs entered by the user
Scanner scnr=new Scanner(System.in);
height=scnr.nextDouble();


//Getting the width entered by the user
System.out.print("Enter wall width (feet):");
width=scnr.nextDouble();


//calculating the area of the wall
area=width*height;


//1.Displaying the area of the wall
System.out.println("Wall area: "+area+" square feet");


//calculating the paint need to paint the area of the wall (In gallons)
paint_needed=area/one_gallon_covers;


//2.Displaying the no of gallons of paint needed to paint the wall
System.out.println("Paint needed: "+paint_needed+" gallons");


//3.Rounding the required gallons of paint to paint the wall
System.out.println("Cans needed: "+Math.round(paint_needed)+" can(s)");
return;
}
}

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Please help me figure out what I am doing wrong.... =[ 2.20 Debugging: Painting

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