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Using precision for floating-point numbers and strings

public class MainClass  {    public static void main( String args[] )    {        double f = 123.94536;        String s = "Happy Birthday";        System.out.printf( "Using precision for floating-point numbers\n" );       System.out.printf( "\t%.3f\n\t%.3e\n\t%.3g\n\n", f, f, f );             System.out.printf( "Using precision for strings\n" );       System.out.printf( "\t%.11s\n", s );    } // end main  } Using precision for floating-point numbers 123.945 1.239e+02 124 Using precision for strings Happy Birth