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This article mainly introduces how to avoid common Perl errors, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

Five common Perl errors

I've been making things with Perl+mdbm+spread recently.

Php has been used for a long time, python and ruby have been used, but Perl has never touched the classic scripting language, and now it is holding a textbook like a primary school student. I found that Perl is really much more difficult. Other things don't make me make mistakes so often.

1. Output * A common Perl error is to output content to a file. The standard syntax is:

PrintSTDERR "thisisanapple."

It's usually written as

PrintSTDERR, "thisisanapple."

Always put an extra comma. To be honest, I seldom make mistakes repeatedly, but I just can't remember this place.

two。 The second common Perl error is that arrows referenced by Hash are often omitted.

It should have been written

Print$hash- > {$key}

Is often written as

Print$hash {$key}

3. The third common Perl error is string comparison:

Php has been used for a long time, always using two equal signs to compare strings. This is wrong. The correct way to write is

If ($vareq "hello") {

Print "world"

}

It is often written as:

If ($var== "hello") {

Print "world"

}

This can lead to logical errors that are difficult to detect.

4. The fourth common Perl error: if statements without parentheses (all bad by php)

The correct way to write it is:

If ($var)

{

Print "yes"

}

Is often written as

If ($var)

Print "yes"

5. There is another Perl error: if it is not brought from php, most people will not make it: omitting semicolons.

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