how to print only first 4 digit of long number

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like the value of factorial number 12 is 479001600 but on console window i want to print only first 4 digit not whole number,like from 479001600 to 4790 only.how can i print first 4 digits?

Posted 11-Feb-13 17:18pm

andy007 2

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PIEBALDconsult · Answer 1 · 2013-02-11T17:28:00

Solution 1

The simplest way is with Substring, but you need to be sure you have at least four digits before you use it.

One of the harder ways is:

int x = 479001600 ;
int y = (int) System.Math.Log10 ( x ) ;
int z = (int) ( x / System.Math.Pow ( 10 , ( y - 3 ) ) ) ;

Posted 11-Feb-13 17:28pm

PIEBALDconsult

Updated 11-Feb-13 17:39pm

v2

Rai Pawan · Answer 2 · 2013-02-11T17:34:00

You should simply be able to convert the int/decimal to a string and subsequently use sub-string function i.e.,

C#

int i = 12;
long factorial = fact(i); //assuming this gives 479001600 

string FirstFourDigits = factorial.ToString(); 

if(FirstFourDigits.Lenght >= 4)
{
  Console.WriteLine(FirstFourDigits.Substring(0, 4));
}
else
{
  Console.WriteLine(FirstFourDigits);
}

And this should be it

Regards
Pawan

call2ram · Answer 3 · 2013-02-11T18:03:00

Solution 3

C#

int t = 554344589;
            Response.Write(Convert.ToString(t).Substring(Convert.ToString(t).Length - 4).PadRight(Convert.ToString(t).Length, ' '));

Posted 11-Feb-13 18:03pm

call2ram