perl function getc

The getc function in Perl is used to read a single character from the input. It returns the next character from the input stream, or undef if there is no more input available.

Here's an example of using getc in Perl:

#!/usr/bin/perl

use strict;
use warnings;

# Open a file for reading
open(my $fh, "<", "input.txt") or die "Can't open input.txt: $!";

# Read and print each character from the input
while (my $char = getc($fh)) {
    print $char;
}

# Close the file
close($fh);

In this example, we open a file called input.txt for reading using the open function. We then read and print each character from the input using the getc function. The while loop continues reading characters until undef is returned, indicating that there is no more input available.

Finally, we close the file using the close function.

When you run this script, it will read each character from the input.txt file and print it to the console. If the file contains the text "Hello, world!", the output would look like this:

Hello, world!

Note that getc reads one character at a time, so it may be less efficient than reading larger chunks of data using functions like read or sysread. However, it can be useful for reading input that is not line-oriented or for parsing input one character at a time.