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
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.jav
Enter wall height (feet): Enter wall width (feet): Wall area: 180.0 square feet Paint needed: 0.5142857142857142 gallons
3. Compare output
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
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 one_gallon_covers=350; //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; } }
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