How to convert a string to a number in Perl?

In Perl, we can convert a string into a number by appending the integer value 0 in front of it. There are some other approaches too, which we will discuss in this tutorial with the help of examples.

Example

Let's first consider the case where the string that we are trying to convert looks something like "123abc" or "23Hzbc". You can see that the it is a mixture of both integer values and characters. Consider the code shown below. 

my $firstStr = '23ASDF';
print "Convering First String to Number: ", $firstStr + 0;
print "\n";
my $secondStr = '123abc';
print "Convering Second String to Number: ", $secondStr + 0;

Output

In the above code, we are just appending the number "0" to convert the given string to an integer. Click "Edit and Run" and check the output of this code −

Convering First String to Number: 23
Convering Second String to Number: 123

Example

Now, let's consider another case where our string looks something like "abc" or "Hello". Consider the code shown below. 

my $str = 'Hello';
print "Converting String to Number: ", $str + 100;
print "\n";
my $anotherStr = 'Sample';
print "Converting String to Number: ", $anotherStr + 0;

Output

In the above code, we are just appending the number 0 and number 100 to convert the string to an integer. Click "Edit and Run" and check the output −

Converting String to Number: 100
Converting String to Number: 0

Example

The other approach to convert a string to a number in Perl is to just append two strings, to get an integer value. Consider the code shown below. 

my $sum = '5.45' + '0.01';
my $anotherSum = '5.01' + '0.07';
print "Addition 1: ", $sum;
print "\n";
print "Addition 2: ", $anotherSum;

Output

Click "Edit and Run" to check the output of this code −

Addition 1: 5.46
Addition 2: 5.08

Conclusion

In this tutorial, we used a few simple examples to demonstrate how you can convert a string to a number in Perl.

Updated on: 04-Apr-2023

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