// TestFormat.java  -- CopyLeft by tsaiwn@csie.nctu.edu.tw
// to test the format capability of the java.text.Format class
import java.text.*;     // Format, NumberFormat, DecimalFormat, ...
public class TestFormat {
   static final String myformat = "0.00"; //Integer part at least one digit
   private static String myfmt(double x, int t, int p){
      DecimalFormat s = new DecimalFormat("##############0.0######");
      s.setMaximumFractionDigits(p);
      s.setMinimumFractionDigits(p);
      int n = t - p - 1;  if(n<0) n=1;  // one position for decimal point
      s.setMaximumIntegerDigits(n);   //  %t.pf
      s.setMinimumIntegerDigits(1);   // at least 1 digits in Integer part
      String ans = s.format(x);
      while(ans.length() < t) ans = " "+ans;
      return ans;
   }
   private static String myfmt(double x, int t){
      return myfmt(x, t, 0);
   }
   private static String myfmt(double x){
      return myfmt(x, 15, 6);  // use %15.6f
   }
   public static void main( String p[])  {
      float x, xdelta;
      double y; long i;
      x = (float)1234567.2;
      xdelta = 0.0001f;
      System.out.println("Before loop, x="+ myfmt(x,14,5));  // %14.5f
      System.out.println("     (double)x="+ myfmt((double)x,14,5));
      System.out.println("xdelta="+ myfmt(xdelta,9,5));  // %9.5f
      for(i=1; i<= 8000; i++){
         x = x + xdelta;     /******/
      }
      System.out.println(" After loop, x="+ myfmt(x,14,5));
      System.out.println("     (double)x="+ myfmt(x,14,5));
      System.out.println("\nDo it again with double y ...");
      y = 1234567.2;
      xdelta = 0.0001F;
      System.out.println("Before loop, y="+ myfmt(y,14,5));
      for(i=1; i<= 8000; i++){
         y = y + xdelta;   /*** promotion is allowed, not coercion ***/
      }                    /*** x = y; is not allowed ! ***/
      System.out.println(" After loop, y="+ myfmt(y,14,5));
      System.out.println("              ="+ myfmt(y,14));
      System.out.println("              ="+ myfmt(y));
      System.out.println(" myfmt(12345, 7)=" + myfmt(12345, 7) );
  System.out.println("3849==="+ new DecimalFormat("##000000").format(3849));
   }
}