S1-IV-Question-Pool Documentation

Transcription

1 S1-IV-Question-Pool Documentation Release Section-I Sep 25, 2017

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3 Contents 1 How to contribute 3 2 The Prologue 7 3 C Language Questions 9 4 C Language Solutions 11 5 Linux Usage Questions 13 6 Linux Usage Solutions 17 7 Python Questions 19 8 Python Solutions 23 9 Shell Questions Shell Solutions SQL Questions SQL Solutions Git Questions Git Solutions Glossary Glossary Index 41 i

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5 Contents: Contents 1

6 2 Contents

7 CHAPTER 1 How to contribute I - Setup Sphinx Install Sphinx, which is a tool that makes it easy to create intelligent and beautiful documentation, written by Georg Brandl and licensed under the BSD license. $> pip install sphinx Note: Better use with virtualenv, if u not familar with please read this Guide. II - Make a new sphinx-project 1. Create a dir for project, e.g.: /home/your-user/s1-iv-pool 2. Then cd into it, and execute sphinx-quickstart 3. Use all the default choice except follow 4 (a) > Separate source and build directories (y/n) [n]: select y here (a) > Project name: give S1-IV-Question-Pool here (a) > Author name(s): give S1 here (a) > Project version: give here 3

8 4. If all ok, u should get follow. -- build -- make.bat -- Makefile `-- source -- conf.py -- index.rst -- _static `-- _templates 5. remove the source dir III - Clone the source repo 1. git clone git@ :yaniwang/interview-questions.git /home/ your-user/s1-iv-pool/source 2. You should get follow structure. -- build -- doctrees `-- html -- make.bat -- Makefile `-- source -- clang_qsn.rst -- clang_sln.rst -- conf.py --.git -- index.rst -- linux_usage_qsn.rst -- linux_usage_sln.rst -- prologue.rst -- python_qsn.rst -- python_sln.rst -- README.rst -- shell_qsn.rst -- shell_sln.rst -- _static `-- _templates 3. Do all the edit, modify, new, remove work just in source. 4. When finishing edit, cd back to project root, execute make html, then you can review the compiled html version in build/html/ 5. cd to source dir, git push to server. The public compiled version will be hosted in it will be automatically updated per each push Warning: If u have trouble during git clone process, please contact yaniwang@redhat.com 4 Chapter 1. How to contribute

9 Warning: Please make absolutely sure no error or warning message in make html output before do git push Warning: Don not CREATE NEW BRANCH and push it. If u feel new branch is necessary, fork the origin repository then submit pull-request IV - Question Basic Format If topic already existed Just follow the format add question in #{topic name}_qsn.rst and add solution in #{topic_name}_sln.rst Add new topic Add like -- #{topic_name}_qsn.rst -- #{topic_name}_sln.rst V - restructuredtext Syntax Sphinx Doc restructuredtext User Document 1.4. IV - Question Basic Format 5

10 6 Chapter 1. How to contribute

11 CHAPTER 2 The Prologue Objective Here We are not here trying to make elixir This project intend to gather everyone s wisdom about What question will you ask as an interviewer Make what we asked more relevant and useful Quote from shwang@ mail Recently, interviewed some candidates with yaning and wshi. It is really a hard problem for us to evaluate the candidate in 1 hours. We d better to make full preparations. How about collecting the useful questions and setting up section interview question bank? It will be helpful for us to improve our interview quality. And make our interviews more efficient. We have at least 9 topics, such as: Work experience Test skills English Virtualization Linux usage Linux theory Python Shell C, Java Let s contribute some questions, grade its degree, write down the answers(or check points) and update some questions quarterly or when we have new ideas. Then improve it with our using experience. It is useful, right? 7

12 Could i get your idea about setting up our interview question bank? Any advice will be welcome! If more people would like to make some contribution, please feel free to add them in cc list. Thanks for your attention and your time. Basic Structure. -- clang_qsn.rst -- clang_sln.rst -- python_qsn.rst -- python_sln.rst If add new topic, please follow above format 8 Chapter 2. The Prologue

13 CHAPTER 3 C Language Questions 01 Easy What is the function of GIT PUSH in GIT? 02 Medium Write a program to reverse print user input single char and multiplying them in recursion style. e.g.: Input: a\n b\n c\n Output: c 9

14 bb aaa 10 Chapter 3. C Language Questions

15 CHAPTER 4 C Language Solutions 01 #include <stdio.h> #define BACK_SLASH '\\' int main(void) { int c; while((c = getchar())!= EOF) { switch(c) { case '\b': putchar(back_slash); putchar('b'); break; case '\t': putchar(back_slash); putchar('t'); break; case BACK_SLASH: putchar(back_slash); putchar(back_slash); break; default: putchar(c); break; } } return 0; } 11

16 02 #include <stdio.h> int temp () { int j = 0; int count; char c; printf("enter a char\n"); do { c = getchar(); } while(c=='\n'); if (c == 'x') return 0; count = temp(); for (j=0;j <count+1;j++) putchar(c); printf("\n"); return count+1; } int print_in_reverse() { int count = 0; count = temp(); printf("%d\n", count); } int main(int argc, char const *argv[]) { print_in_reverse(); return 0; } 12 Chapter 4. C Language Solutions

17 CHAPTER 5 Linux Usage Questions 01 Medium What Linux distribution have you used? How did you installed it? How did you do work on it? How did you customize it to satisfy yourself? 02 Easy How to install software on it? Try to describe the whole process base on your understandings as deep as possible. 13

18 03 Easy How to upgrade the system? How it matters (does it important)? Why? 04 Easy How to make a program (write by yourself) executable just by typing its name? 05 can name 1 way - Easy can list more than 2 - Medium How to synchronize a directory between two hosts? 06 depend on the details of answer Medium or Hard Have you ever customized the kernel? if yes, how did you do that? 14 Chapter 5. Linux Usage Questions

19 07 Medium or Hard Could you try to explain what happens behind the scenes after type sina.com.cn in browser client?

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21 CHAPTER 6 Linux Usage Solutions 04 $> chmod +x [prog] $> chmod 777 [prog] 17

22 18 Chapter 6. Linux Usage Solutions

23 CHAPTER 7 Python Questions 01 Esay What s list comprehension? can you give an example 02 Easy What s the difference between str() and repr() 03 19

24 Easy How to check code style for python code? 04 Medium Do you know virtual environment? What s the benefit to use it and how? 05 Easy sum , write the code out there 06 Medium Do you know any difference between python 2 and python 3? 20 Chapter 7. Python Questions

25 07 Hard Open a file and read it last 4K? Could tell to use the seek method is fine. 08 Medium What is Duck Type in python, give a example 09 Hard What is Coroutine in python, give a example

26 22 Chapter 7. Python Questions

27 CHAPTER 8 Python Solutions 01 [x for x in xrange(10)] 02 The str() function returns representations of values which are human-readable, while repr() generates representations which can be read by the interpreter. 03 pep8 and pylint 04 to create isolated Python environments 05 sum(xrange(1000)) 23

28 06 the print function changes integer division changes (3 / 2 = 1 in python 2, 3 / 2 = 1.5 in python 3) unicode redesign: python 3 has byte and bytearray xrange in python 3 exceptions: except NameError as err 07 with open("thefile") as fp: fp.seek(-4096, OS.SEEK_END) fp.read() 08 duck typing is a style of typing in which an object s methods and properties determine the valid semantics, rather than its inheritance from a particular class or implementation of an explicit interface An Example: class Duck: def quack(self): print "Quack, quack!" def fly(self): print "Flap, Flap!" class Person: def quack(self): print "I'm Quackin'!" def fly(self): print "I'm Flyin'!" def in_the_forest(mallard): mallard.quack() mallard.fly() in_the_forest(duck()) in_the_forest(person()) Output: Quack, quack! Flap, Flap! I'm Quackin'! I'm Flyin'! 24 Chapter 8. Python Solutions

29 09 Coroutines are program components that generalize subroutines to allow multiple entry points for suspending and resuming execution at certain locations. Coroutines are well-suited for implementing more familiar program components such as cooperative tasks, iterators, infinite lists and pipes

30 26 Chapter 8. Python Solutions

31 CHAPTER 9 Shell Questions 01 What s the different between using source and bash command to execute a script. 02 Is there any problem in follow shell script? If so, please correct it for i in $(ls *.mp3); do some command $i done 27

32 28 Chapter 9. Shell Questions

33 CHAPTER 10 Shell Solutions 01 source means using the current shell to run a script. bash means openning a sub sehll to run a script. 29

34 30 Chapter 10. Shell Solutions

35 CHAPTER 11 SQL Questions 01 Esay without constraints Medium with constraints set Create two tables that satisfy the following requirements departments Table Column Type Constraint id int Primary key name varchar(30) employees Table Column Type Constraint id int Primary key name varchar(30) department_id int Foreign key references Department(id) salary decimal 02 31

36 Medium Assume data is already populated in the tables, find out all departments of which the average salary is greater than Chapter 11. SQL Questions

37 CHAPTER 12 SQL Solutions 01 create table departments( id int not null, name varchar(30), primary key (id) ); create table employees( id int not null, name varchar(30), department_id int not null, salary decimal, primary key (id), foreign key (department_id) references department(id) ); 02 select d.name, avg(e.salary) from departments d, employees e where d.id = e.department_id group by d.name having avg(e.salary) > ; 33

38 34 Chapter 12. SQL Solutions

39 CHAPTER 13 Git Questions 01 Easy What is the function of GIT PUSH in GIT?. 02 Easy What is Staging Area or Index in GIT? 03 35

40 Easy What is the common branching pattern in GIT? 04 Medium Why is it advisable to create an additional commit rather than amending an existing commit? 05 Medium How do you stop tracking a file that already in git repo? 36 Chapter 13. Git Questions

41 CHAPTER 14 Git Solutions 01 GIT PUSH updates remote refs along with associated objects. 02 Before completing the commits, it can be formatted and reviewed in an intermediate area known as Staging Area or Index. 03 The common way of creating branch in GIT is to maintain one as Main branch and create another branch to implement new features. This pattern is particularly useful when there are multiple developers working on a single project. 04 There are couple of reason 1. The amend operation will destroy the state that was previously saved in a commit. If it s just the commit message being changed then that s not an issue. But if the contents are being amended then chances of eliminating something important remains more. 2. Abusing git commit- amend can cause a small commit to grow and acquire unrelated changes. 37

42 05 $> git rm --cached <obj> 38 Chapter 14. Git Solutions

43 CHAPTER 15 Glossary DAS direct-attached storage NAS network attached storage PTO Paid Time Off RAL Puppet s resource abstraction layer RHBA are bug fix advisories and correct defects RHEA are enhancement advisories to add additional features or functionality RHEL Red Hat Enterprise Linux RHSA are security advisories and patch security vulnerabilities SAN storage area networks WFH work from home 39

44 40 Chapter 15. Glossary

45 CHAPTER 16 Glossary Index genindex 41

46 42 Chapter 16. Glossary Index

47 Index D DAS, 39 N NAS, 39 P PTO, 39 R RAL, 39 RHBA, 39 RHEA, 39 RHEL, 39 RHSA, 39 S SAN, 39 W WFH, 39 43