Perl implicitly automatically converts strings and numbers. It is very easy to write a script because there is no need to explicitly convert strings and numbers as in C and Java.
my $num1_str = "100"; my $num1 = 100; my $num1_total = $num1_str + $num1;
When the string "100" is used as a numerical value, it is automatically converted to 100 and calculated.
Learn how Perl interprets strings as numbers.
my $num2_str = "34A11";
"34A11" is converted to 34 when used as a number. The part of the number that continues from the beginning is converted to a number.
If you write use warnings ;, you will be warned if you try to use a string that does not consist only of numbers as a number.
The empty string "" is calculated as 0 (again, it is not a number, so a warning is given).
This is an example to check the automatic conversion of numbers and strings.
use strict; use warnings; my $num1_str = "100"; my $num1 = 100; my $num1_total = $num1_str + $num1; print "(1) Automatic conversion from string to number\n"; print "\$num1_total = $num1_total\n\n"; # If this string is used as a number, then 34 # Treated as . # As a number if use warnings are enabled # If you try to use it, you will be warned. my $num2_str = "34A11"; my $num2 = 3; my $num2_total = $num2_str + $num2; print "(2) Calculated using the numbers that continue from the beginning.\n"; print "\$num2_total = $num2_total\n";