printing out contents of ZZ number

Asked Jul 15 '14 at 08:51

Active Jul 15 '14 at 12:49

Viewed 122 times

I am using NTL's ZZ class to work with large numbers. Suppose I have 10000 such numbers, and I want to find the product of all these numbers. Calculating the product of these numbers takes about only 30 secs. However, to print the product of these numbers to the console of the file requires 30 mins! Below is the command I used.

cout << product << "\n"

Why is this so? Is there any way to speed up the printing of the product of the 10000 numbers? Thanks in advance

edited Jul 15 '14 at 12:49

timrau

22,578
4
51
64

asked Jul 15 '14 at 08:51

meta_warrior

Have you tried to redirect the output to a file? – timrau Jul 15 '14 at 08:55
How many digits has your number? The console is really slow, you should try to output in a file. – Holt Jul 15 '14 at 08:55
@timrau: Yes It is still very slow. – meta_warrior Jul 15 '14 at 08:58
@Holt: about 3 million digits. I have done that! – meta_warrior Jul 15 '14 at 08:59
How about the discussions in http://stackoverflow.com/q/1736267/718379 ? – timrau Jul 15 '14 at 09:00
4

@freak_warrior, quite congruous. To output 3 million decimal digits, you need to execute 3 million integer divisions. You told us you'd needed 30 seconds to do 10000 multiplications, so 30 minutes for 3 million divisions doesn't seem too much excessive. – ach Jul 15 '14 at 09:03

printing out contents of ZZ number

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