Thread: modular programming, converting to degrees

Hi everyone, I've been given an assignment for practice and it has to do with calculating the sine again but this time I have to use modular programming. I already have a working inlined program, so I'm pretty sure I'll be able to do it.

Apparently when I tried to convert degrees to radians using a subroutine, I get an error when I run it.

Original Code

import java.io.*;
 
public class HW6X
{
 
public static void main(String args[]) throws IOException
{
BufferedReader keybd = new BufferedReader(new InputStreamReader(System.in));
 
double x;
int maxe;
 
System.out.println("Enter a value in degrees: ");
x = Double.parseDouble(keybd.readLine());
 
System.out.println(convert(x));
 
}
 
public static double convert(double x)
{
        x = x * Math.PI / 180;
        return x;
}
}

Error:

Exception in thread "main" java.lang.NoClassDefFoundError: HW6X/java
Caused by: java.lang.ClassNotFoundException: HW6X.java
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
Could not find the main class: HW6X.java.  Program will exit.

I tried googling this problem and others have said that it has to do with the classpath. I'm not sure what they meant by this, if it's the reason for the error. I think if I find out why this doesn't work, then I'll be able to do the rest of the program without any problem.

Originally Posted by KevinWorkman

Did you google classpath? Do you know what it is?

Recommended reading: http://download.oracle.com/javase/tu...ems/index.html

WOW, major face palm! I just realized that I made a HUGE mistake and I think I tried to run the program with .java at the end instead of the file name. Thank you for the recommended reading, it helped me learn about classpath and how important it is! Sorry for wasting your time, I can't believe that I did such a beginner mistake (although I am a beginner).