Assignment #93 and Distance Formula

Code

    ///Name: Tim Gibson
    ///Period: 6
    ///Project Name: Distance Formula
    ///File Name: Distance Formula.java
    ///Date Finished: 11/9/15
        
    public class DistanceFormula
    {
    	public static void main( String[] args )
    	{
    		// test the formula a bit
    		double d1 = distance(-2,1 , 1,5);
    		System.out.println(" (-2,1) to (1,5) => " + d1 );
     
    		double d2 = distance(-2,-3 , -4,4);
    		System.out.println(" (-2,-3) to (-4,4) => " + d2 );
     
    		System.out.println(" (2,-3) to (-1,-2) => " + distance(2,-3,-1,-2) );
     
    		System.out.println(" (4,5) to (4,5) => " + distance(4,5,4,5) );
    	}
     
    	public static double distance( int x1, int y1, int x2, int y2 )
    	{
    		int a = ( x2 - x1 );
            int b = ( y2 - y1 );
            int c = ( a * a ) + ( b * b );
            double d = Math.sqrt(c);
            
            return d;
    	}
    }
        
    

Picture of the output