Factorial in Scientific notation

Question

I want to show factorial of a number in scientific notation.

For example - 100! = "9.332621544e+157"

Is there any other way to do this besides NumberFormat? This is my code so far -

BigDecimal res=new BigDecimal("1");
for(int i=2;i<=x;i++){
   res=res.multiply(BigDecimal.valueOf(i));
}
str=String.valueOf(res+"");
display.setText(str);

I'm really sorry if this question is vague to understand. Any help would be appreciated. Thanks in advance.

my teacher didn't teach that.... so i can't use it in my project :) — MI Sabic, Aug 04 '16 at 14:53

score 1 · Accepted Answer · answered Aug 04 '16 at 15:12

1

Not nice but changing

str=String.valueOf(res+"");

to

String str=res.doubleValue()+"";

will do the job

answered Aug 04 '16 at 15:12

Eritrean

15,851
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score 0 · Answer 2 · answered Aug 04 '16 at 14:58

0

Using NumberFormat is the way to go but if you don't want to use that you could use a PrintStream

See Formatting Numeric Print Output for more info

answered Aug 04 '16 at 14:58

Jayfray

415
3
12

Factorial in Scientific notation

2 Answers2