Perl Interview Questions and Answers
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Best Perl Interview Questions and Answers
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Q1) What is Perl? What do you understand by it?
Answer: When it comes to choosing to the most powerful and reliable scripting language in the field of computer programming “Pearls” appears on the top of the list. The language has already gained popularity among the developers for its high-level features such as array manipulation, string manipulation, and Unicode support that are useful when it comes to developing real-life applications.
Q2) What is the full form of Perl?
Answer: The ‘Perl’ is the abbreviated term for the “Practical Extraction and Reporting Language” which is one of the strongest programming languages one the earth enriched with a number of features.
Q3) Describe the uses of the Perl?
Answer: Perl is basically used for critical projects including the defence projects and rapid prototyping.
Q4) Does the Perl programming have objects? Does it force you to use it?
Answer: Yes, the Perl programming contains objects and the programming language itself doesn’t force you to use any certain objects.
Q5) Can you dynamically load the binary extension in Perl?
Answer: Yes, the language allows you to load the binary extension dynamically if your system supports it. If your system doesn’t support it then you have to statistically compile the extension.
Q6) Write down the numeric operators in the Perl programming?
Answer: There are various operators in Perl including:
- Comparison operators
- Arithmetic operators
- Bitwise Operators
- String concatenation:
- comparison operators
From the above, the athematic operators work from left to right while on the other side the Bitwise operators work from right to left.
Q7) Write down flags or arguments that are used while executing a program in Perl?
Answer: There are so many different flags or arguments that are used in Pearl and some of them are given below;
- e- Denotes execute
- d-Denotes debugging
- w- Denotes warning
- c- Denotes compile only
Apart from these, the user can also leverage the combination of different arguments together.
Q8) Do the Perl variables have data type?
Answer: No, the Perl variables do not have any data type.
Q9) Which one has the highest precedence, Terms or list?
Answer: When it comes to making a comparison among the Terms or list, the terms have the highest precedence in the Perl programming.
Q10) Write down the data types that pearl can handle?
Answer: The Perl programming can easily handle:
- Arrays- (@)
- Scalars- ($)
- Hashes- (%)
Whereas scalar just stores a sole value, arrays contain the list of scalars and hashes out of all contain arrays in Perl programming.
Q11) What -p and -n denotes in the Perl programming?
Answer: Both –n and- p are used to wrap up scripts in the loops. The –n is utilized to command the Perl language to execute the script in the loop. Whereas the –p performs the same task as –n but in addition, it uses continuously. In more concise words, both –n and –p is used together to execute the script.
Q12) Are Perl aliases faster than references? What do you think?
Answer: Yes, Perl aliases are faster than references and it is just because aliases don’t require any deferral.
Q13) Write down primary dereferences in the Perl Programming?
Answer: The essential dereferences in the Perl includes:
- Hash variable (%)
- Subordinates (&)
- Arrays (@)
- Scalar ($)
Q14) Write down any common instances in the CPAN module?
Answer: DBI and CGI are the two most common packages in the CPAN module.
Q15) Is the Perl case sensitive programming language?
Answer: Yes, similar to the Ruby, C++, and Java, Perl is also a case sensitive programming language.
Q16) Name the feature that provides code usability to the Perl?
Answer: The inheritance feature of the Perl programming gives it the code usability. In the inheritance feature, the child class can easily utilize the properties and methods of the parent class.
Q17) What option you would choose to scroll in Perl?
Answer: The built-in debugger can be used to scroll the entire program in the Perl language. Through this feature, you can also analyse the entire program line-by-line.
Q18) What are the first-hand guidelines of Perl, every user must follow?
Answer: Some guidelines in the Perl programming must be followed by users including:
- The package name must begin with a capital letter.
- The file you are using must have .pm in extension
- In case if the user is going with no object-oriented technique then he has to be derived from exporter class
Q19) Why do you use ‘$_’ in Perl?
Answer: ‘$_’ in the Perl programming denotes the default variable in Perl programming and often known as default input and pattern space.
Q20) Highlight one main difference between exit and die in Perl?
Answer: Die will send a message before ending a program while exit will just end the program without sending any message.
Q21) Describe the purpose of group function in Perl?
Answer: In the Perl programming, group function is used to filter the list and find out elements that matches certain criteria.
Q22) Why -> symbol is used in Perl programming?
Answer: The arrow “->” symbol is used in the Perl programming to reach out a particular object.
Q23) Describe ways you can express string in Perl programming?
Answer: There are different ways to express string in the Perl programming. For example “this is mike66”
- qq/this is mike66 double quoted string/
- qq^ this is mike66 double quoted string^
- q/this is mike66/
- q&this is mike66&
- q(this is mike66)
Q24) Explain what CPAN denotes?
Answer: The CPAN is the abbreviated term for the Comprehensive Perl Archive Network, which is a hub of Perl documentation and software.
Q25) What do you understand by the closure in Perl?
Answer: In the Perl programming “closure” is used to block the codes to seal the environment where it is actually defined. Basically, it is implemented in the first place to capture any lexical variables that block consists of uses in outer space.
Q26) What is Perl one-liner?
Answer: The Perl one line is the command that can be executed on an immediate basis.
Q27) Describe the Ivalue?
Answer: Ivalue is the scalar value which is used by the developers to store down the result they have received from any expression. You can usually spot at the left-hand side of expression in memory.
Q28) How many control keys are there in Perl language?
Answer: In the Perl language, there are three main control keys known as:
- Redo statement
- Next statement
- Last statement
Q29) What -a hold in the Perl programming?
Answer: The -an argument in the Perl programming denotes the command to automatically split the group of input files.
Q30) Who was the creator of Perl programming?
Answer: Perl- the high-level open-source programming language was created by famous developer “Larry Wall”.