Basic Java Computation Help Ap Computer Science

[Sean_J]

Hello Guys here is the problem that im stated with and in my code im getting errors because i cant find out how to input the code the correct way. Here is the problem.

Project… Compute This
Create a new project called ComputeThis having a class called Tester. The main method of Tester should calculate the value of the following formulas and present the answers as shown.
d1 = 3πsin(187°) + |cos(122°)|
…Remember that the arguments of sin and cos must
be in radians.
d2 = (14.72)3.801 + ln 72
…ln means log base e
The output of your code should appear as follows:
d1 = -0.618672237585067
d2 = 27496.988867001543

This is what i have so far as my code.

public class lesson6
  //Sean Josephson
  //2/8/2010
  //Lesson 6 Project
{
  public static void main(String args [])
  {
    System.out.println d1=3Math.Pi doublesin(double toRadians(double187)+double abs(double cos(double122))
  }
}

Anything Helping correcting my brutal slaying of this advanced math method would be helpful.

[m00nchile]

First of all, make sure your syntax gets a bit of a brushwork. All methods in Java are of the type:

method(argtype arg1, argtype arg2....);
//or with no arguments
method();

Next, while you can do a lot of things in a single line of code, it can get very illegible and hard to maintain, so I would reccomend slicing up your code into smaller bits and pieces.

public class Assignment {
   public static double toRadians(double degrees) {
       return (double)((Math.PI*2*degrees)/360);
   }
   public static void main(String[] args) {
      double sinargDegs = 187;
      double cosargDegs = 122;
      double sinarg = toRadians(sinargDegs);
      double cosarg = toRadians(cosargDegs);
      //rest of code for calculation
   }
}

You have quite a bit of help here, so I think you can go on from this to finishing your task by yourself.

EDIT: Fixed getting PI variable from Math class
EDIT2: Just browsed through Math api, there already is a toRadian() method there.

[Sean_J]

thanks m8 i actually finished htis up nicely and i got this as a result to get the correct output.

public class lesson6
  //Sean Josephson
  //2/8/2010
  //Lesson 6 Project
{
  public static void main(String args[])
  {
    double a=Math.PI; 
    double x=Math.toRadians(187);
    double z=Math.toRadians(122);
    double b=Math.sin(x);
    double c=Math.cos(z);
    double e=Math.abs(c);
    double d1=3*(a)*(b)+(e);
    System.out.println("d1"+" "+ "="+" "+ d1);
    System.out.println(" ");
    double ln=Math.log(72); 
    double f=Math.pow(14.72,3.801);
    double d2=(f)+ln;
    System.out.println("d2"+" "+"="+" "+d2);
  }
}

[m00nchile]

Just a minor nitpick,
You don't need to build strings like that, you could simply write:

System.out.println("d1 = "+d1);

Make life simpler for yourself :)

[Sean_J]

Ha, that would have shortened it up a little already submitted it though :"(

[m00nchile]

It's no biggie, what you wrote is correct, just a bit overcomplicated :)

[Sean_J]

Can someone post a revision of this that will use the least amount of memory?? (Very please and thank you) Just so i know what to not have to do in the future. (: