How to convert a Perl string to a number?

In Perl, you can use the built-in int() function to convert a string to an integer.

For example, assume there is a string $str = “1234”, it can be converted to an integer using the following code:

my $num = int($str);
print $num;  # 输出：1234

Similarly, you can use the eval() function to convert a string to a floating point number.

For example, assuming there is a string $str = “3.14”, you can convert it to a floating point number using the following code:

my $num = eval($str);
print $num;  # 输出：3.14

It is important to be cautious when using the eval() function, as it executes strings as Perl code. Make sure that the content of the string is trustworthy when using the eval() function to avoid security risks.