Java Program for Calculating Interest

// Simple example to calculate Interest
class  CompInterest
{
public static void main( String args[ ] )
{
 double a, p, r ,n ,ci;
 p = 1000;
 r = 10;
 n = 3;
      a = p * Math.pow(( 1 + ( r / 100.0 ) ), n );
      ci = a - p;
     System.out.println( " Amount = " + a );
 System.out.println( " Compound interest = "  + ci );
   }
}

Output:
Amount = 1331.0000000000005
Compound interest = 331.000000000000045