Perl's **"Not enough arguments for subroutine"** error is a compile-time error encountered when a subroutine is provided with fewer arguments than expected. It prevents code compilation.

The process is illustrated below:

<h2>Error format</h2>

The format of the *"Not enough arguments for subroutine*" error is shown below:

```none
Not enough arguments for %s at %s, near %s
```

Each placeholder, `%s`, represents the subroutine name, the line number where the error occurred, and the argument that caused the error, respectively.

<h2>Example</h2>

The following example shows how the *"Not enough arguments for subroutine*" error arises in Perl:


#!/usr/bin/perl

# Subroutine to add two numbers
sub findSum ($$) {
  my ($p1, $p2) = @_;
   print ("The sum is ", $p1 + $p2, ".\n");
}

# Valid call to subroutine
findSum(10, 20);

First, a subroutine named `findSum` that expects $2$ parameters is initialized. The code proceeds to call the `findSum` subroutine with $2$ arguments in line $10$. Since the number of provided arguments matches the expected parameters, the code executes without any errors. 

However, if fewer than $2$ arguments are provided to the `findSum` subroutine, then the *"Not enough arguments for subroutine*" error is thrown, and the code fails to compile, as shown below: 

#!/usr/bin/perl

# Subroutine to add two numbers
sub findSum ($$) {
  my ($p1, $p2) = @_;
   print ("The sum is ", $p1 + $p2, ".\n");
}

# Invalid call to subroutine
findSum(10);

The code above attempts to call the `findSum` function with $1$ argument, which results in an error. The error alerts the user to the subroutine name, the line number where the error occurred, and the argument that caused the error, i.e., `main::findSum`, line $10$, and `10`, respectively. As a result, the code fails to compile.

What is the 'Not enough arguments for subroutine' error in Perl?

Error format

Example