perl Math::BigInt->length()用法及代码示例

Math::BigIntPerl中的module提供了代表具有任意精度的整数和重载算术运算符的对象。

length()Math::BigInt模块的方法用于获取给定数字的长度，即给定数字中的位数。

用法： Math::BigInt->length()

参数：没有

返回：一个整数值，代表给定数字的长度。

范例1：用于Math::BigInt->length()计算数字位数的方法

#!/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";

输出：

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

范例2：用于Math::BigInt->length()将给定数字分为两半的方法。

#!/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";

输出：

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

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注：本文由纯净天空筛选整理自ihritik大神的英文原创作品 Perl | Math::BigInt->length() method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。