### Question:
Format { public static String dfrac(double d, int fixed_decimals) { return formatDouble(d, 100, fixed_decimals).trim(); }  static void tab(StringBuilder sbuff, int tabStop, boolean alwaysOne); static String s(String s, int width); static String pad(String s, int width, boolean rightJustify); static String i(int v, int width); static String l(long v, int width); static String d(double d, int min_sigfig); static String d(double d, int min_sigfig, int width); static String dfrac(double d, int fixed_decimals); static String formatDouble(double d, int min_sigFigs, int fixed_decimals); static String formatByteSize(double size);  }### Answer:
@Test public void testDfrac() { double num = 1.00003; assertThat(dfrac(num, 0)).isEqualTo("1"); assertThat(dfrac(num, 1)).isEqualTo("1.0"); assertThat(dfrac(num, 2)).isEqualTo("1.00"); assertThat(dfrac(num, 3)).isEqualTo("1.000"); assertThat(dfrac(num, 4)).isEqualTo("1.0000"); assertThat(dfrac(num, 5)).isEqualTo("1.00003"); assertThat(dfrac(num, 6)).isEqualTo("1.000030"); }