import java.util.Random;

/**
 *
 * @author JakeFromStateCS
 */
public class DoubleDifference {

    public static void main(String[] args) {
    double testArray1[] = new double[10];
    for( int i = 0; i < 10; i++ ) {
        testArray1[i] = getRandomDouble( -10.0, 10.0 );
    }
    double difference = getDifference( testArray1 );
    System.out.println( "The difference is: " + difference );
    }

    /*
    getRandomDouble:
    Input:
        lowerBound: The lowest possible number
        upperBound: The highest possible number
    Purpose:
        Generates a random double between the lower and upper bounds
    Returns:
        double result: The result of the random generation
    */
    public static double getRandomDouble( double lowerBound, double upperBound ) {
    //Returns a random double between 0 and 1
    double randomDouble = new Random().nextDouble();
    //If lowerBound is 2, upperBound is 10 and randomDouble is 0.3
    // 2 + ( 0.3 * ( 10 - 2 ) )
    // 2 + ( 0.3 * 8 )
    // This shifts the number scale to the right
    double result = lowerBound + ( randomDouble * ( upperBound - lowerBound ) );
    return result;
    }

    /*
    getDifference:
    Input:
        input: An array of doubles
    Purpose:
        Return the difference between the highest and lowest value in an array of doubles
    Returns:
        double: The difference between the largest and smallest value in an array of doubles
    */
    public static double getDifference( double input[] ) {
    //We want to set the smallest value to the largest value possible
    //This way, every value will be lower than or equal to this one
    double smallestValue = Double.MAX_VALUE;
    //We want to set the largest value to negative Double.MAX_VALUE
    //This will ensure that it is not possible for there to be a smaller value
    double largestValue = -Double.MAX_VALUE ;

    //Loop through each element of the array
    for( int key = 0; key < input.length; key ++ ) {
        double value = input[key];
        if( value > largestValue ) {
        largestValue = value;
        }
        if( value < smallestValue ) {
        smallestValue = value;
        }
        System.out.println( "input[" + key + "] = " + value] );
    }
    System.out.println( "Largest: " + largestValue );
    System.out.println( "Smallest: " + smallestValue );
    return largestValue - smallestValue;
    }
}