Perl | Math::BigInt->length() method

Last Updated : 03 Oct, 2019

Math::BigInt module in Perl provides objects that represent integers with arbitrary precision and overloaded arithmetical operators.

length() method of Math::BigInt module is used to get the length of the given number i.e the count of digits in the given number.

Syntax: Math::BigInt->length()

Parameter: None

Returns: an integer value which represents the length of the given number.

Example 1: Use of Math::BigInt->length() method to count digits in a number

#!/usr/bin/perl  
  
# Import Math::BigInt module 
use Math::BigInt; 
  
# Specify number 
$num = 78215936043546; 
  
# Create BigInt object 
$x = Math::BigInt->new($num); 
  
# Get the length (or count of  
# digits) of the 
# given number using 
# Math::BigInt->length() method 
$len = $x->length(); 
  
print "Length of $num is $len.\n"; 
  
# Specify another number 
$num = 7821593604584625197; 
  
# Create BigInt object 
$x = Math::BigInt->new($num); 
  
# Get the length (or count of  
# digits) of the 
# given number using 
# Math::BigInt->length() method 
$len = $x->length(); 
  
print "Length of $num is $len.\n"; 

Output:

Length of 78215936043546 is 14.
Length of 7821593604584625197 is 19.

Example 2: Use of Math::BigInt->length() method to split a given number into two halves.

#!/usr/bin/perl  
  
# Import Math::BigInt module 
use Math::BigInt; 
  
# Specify number 
$num = 78215936043546; 
  
# Create BigInt object 
$x = Math::BigInt->new($num); 
  
# Get the length (or count of  
# digits) of the 
# given number using 
# Math::BigInt->length() method 
$len = $x->length();  
  
# Variable to store first half 
$firstHalf = 0; 
$i = 1; 
  
# loop to calculate first half 
while($i <= ($len/2)) 
{ 
    $firstHalf = ($firstHalf * 10) +  
                    $x->digit(-$i); 
    $i = $i + 1; 
      
} 
  
# Variable to store second half 
$secondHalf = 0; 
  
# Loop to calculate second half 
while($i <= $x->length()) 
{ 
    $secondHalf = ($secondHalf * 10) +  
                      $x->digit(-$i); 
    $i = $i + 1; 
} 
  
# Note: Math::BigInt->digit() method 
# returns the digit at ith position  
# from right end of the given number 
# a negative value of i is used 
# to get ith digit from left end  
# of the given number 
  
# Print original number 
print "Original number: $num\n"; 
  
# Print first half 
print "First half: $firstHalf\n"; 
  
# Print Second half 
print "Second half: $secondHalf"; 

Output:

Original number: 78215936043546
First half: 7821593
Second half: 6043546

Perl | Math::BigInt->config() method

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