how to display the more decimal?

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Example is
data test;
a=1/9;
run;
proc print data = test;
var a;
format a 19.16;
run;

However, the result shows 0.1111111111111100, rather than 0.1111111111111111 as I expected.

Please give me your warm hands to figure this out.
Thanks

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关键词：Display decimal disp More play display figure result

Total it is 64 bits for a 8 byte number (SAS default)

    Sign bit: 1 bit
    Exponent width: 11 bits
    Significand precision: 53 bits (52 explicitly stored)



That is how precision digits it can go.

data _null_;
do i= 50 to 55;
  x=2**(-i);
  put i= x= 19.16;
  end;
run;

Thanks. Your code is to generate the new data with 16 decimal. My purpose is to input and display the existing data with 16 decimal. Please let me know how to do.

e.g.
data test;
input a 19.16;
cards;
0.11111111111113112
;
run;
proc print data = test;
var a;
format a 19.16;
run;

The results is still
Obs a
1 0.1111111111111300, not 0.11111111111113112