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Thread: ...differ in length error; homework starter code not working.

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    Default ...differ in length error; homework starter code not working.

    This is NOT my code, but I'm supposed to use it to help me with completing the final thing. The problem is, when I compile it, I get an error saying that method calcGravity in class Gravity1 cannot be applied to given types; required: double[] found: double[],double[] reason: actual and formal argument lists differ in length. I haven't edited it yet, but I wanted to get this part fixed before I do so. Here's the whole starter code:

    import java.io.IOException;
    public class Gravity1
    {
        public static void main(String[] args) throws IOException 
        { 
           String[] names = {"Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune", "Pluto"}; 
           double[] radii = {2439.7, 6051.9, 6378, 3402.5, 71492, 60270, 25562, 24774, 1195}; 
           double[] masses = {3.3022 * Math.pow(10,23), 4.8685 * Math.pow(10,24), 5.9736 * Math.pow(10,24), 6.4185 * Math.pow(10,23), 1.8986 * Math.pow(10,27), 5.6846 * Math.pow(10,26), 8.6810 * Math.pow(10,25), 1.0243 * Math.pow(10,26), 1.312 * Math.pow(10,22)}; 
     
           // alternate 
           //double [] mass = {3.30E23, 4.87E24, 5.97E24, 6.42E23, 1.90E27, 5.68E26, 8.68E25, 1.02E26, 1.27E22};
           double[] gravities = calcGravity(radii, masses);
     
           printResults(names, radii, masses, gravities); 
           printToFile(gravities); 
        } 
        //The return type for printResults is void because you are not returning anything. 
     
        //The return type for calcGravity is an array of doubles: 
        public static double [] calcGravity (double[] arrayDoubles){
            double earthGravity = 6.67 * Math.pow(10, -17) * massOfPlanet/ Math.pow(radiusOfPlanet, 2); //The general formula to find gravity: 
        }
        //where massOfPlanet and radiusOfPlanet are replaced in the above formula by array values. 
     
    }

    The line is pointing to double[] gravities = calcGravity(radii, masses);


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    Default Re: ...differ in length error; homework starter code not working.

    What exactly do you expect to happen? The calcGravity method takes one argument- an array of doubles. You're trying to pass two different arrays into it.
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    Default Re: ...differ in length error; homework starter code not working.

    The goal of it is to calculate each planet in our solar system its surface gravity. Though, I'm not sure what double[] gravities = calcGravity(radii, masses); is supposed to be doing. I am supposed to recreate the formula for determining planet surface gravity which I thought would be assigned to double[] gravities. Perhaps I'm supposed to include the formula somewhere in gravities variable but you'r saying there's supposed to be one argument. Maybe I should make a new line assigning double[] calcGravity the formula for surface gravity instead.

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