Introduction to C++ SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong

Transcription

1 Introduction to C++ Prof. Jinkyu Jeong TA -- Minwoo Ahn TA -- Donghyun Kim Computer Systems Laboratory Sungkyunkwan University SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong

2 Object-oriented programming Vehicle class Inheritance SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong 2

3 The C++ Programming Language C++ Object-Oriented Extended from C New standards: C++11, C++14 GNU compiler $g++ -std=c++[version] o [exetuable] [source code] Example $g++ -std=c++11 o hello main.cpp $g++ -std=c++14 o hello main.cpp SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong (jinkyu@skku.edu) 3

4 vi command Writing and quitting vi :q Quit vi, unless the buffer has been changed :q! Quit vi without writing :w Write the file :wq Write the file and quit vi Searching /string search forward for occurrence of string in text?string search backward for occurrence of string intext n continue searching in the previous direction N continue searching in the opposite direction SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong (jinkyu@skku.edu) 4

5 vi command (cont d) Appending text (end with <esc>) i before the cursor I before the first char of the line o on a new line below the current O on a new line above the current Deleting text dd delete the line D delete the rest of the line Copying and pasting text yy copy the current line into the buffer p paste the line in the buffer into the text after the current line SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong (jinkyu@skku.edu) 5

6 vi command (cont d) Below commands can added to ~/.vimrc file ~/.vimrc includes commands to execute at the beginning set autoindent set martindent set tabstop=[number] set mouse=a set nu Automatically indent Set tab length Enable mouse Show line numbers SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong 6

7 IDE & Tutorials Online IDEs for C++ Tutorialspoint Online IDEs ( ound.htm) Goorm.io ( Create a C/C++ container C++ tutorials Cplusplus.com ( Also, recommended reference for predefined templates LearnCpp.com ( Tutorialspoint ( C++ youtube video ( SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong (jinkyu@skku.edu) 7

8 Hello C++ // First c++ app in this class #include <iostream> int main() { std::cout << "Hello, C++ Intro!\n"; } return 0; // single line comment /* multiple-line comments second line comment */ SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong (jinkyu@skku.edu)

9 Hello C++ (namespace) // First c++ app in this class #include <iostream> using namespace std; int main() { cout << "Hello, C++ Intro!" << endl; } return 0; using namespace xxx sets default namespace to look for SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong (jinkyu@skku.edu) 9

10 Console I/O Output cout << test << my skill\n ; cout << test << my skill << endl; Input cin >> n; #include <iostream> using namespace std; int main() { int n; } cin >> n; cout << "n = " << n << endl; SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong (jinkyu@skku.edu) 10

11 String input String type string s; getline(cin, s) Input a line of string #include <iostream> #include <string> using namespace std; int main() { string s; cin >> s; cout << "s = " << s << endl; } #include <iostream> #include <string> using namespace std; int main() { string s; getline(cin,s); cout << "s = " << s << endl; } SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong (jinkyu@skku.edu) 11

12 String stream Convert string into stream #include <iostream> #include <string> #include <sstream> using namespace std; int main() { string str = "one two three"; stringstream ss(str); } string tok; while (ss >> tok) cout << tok << endl; SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong (jinkyu@skku.edu) 12

13 I/O redirection Redirect stdout to a file $./hello > list_out Create if not present, otherwise overwrite it $./hello >> list_out Create if not present, otherwise append to it Redirect stdin from a file $./hello < list_input Accept input from a file SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong (jinkyu@skku.edu) 13

14 Lab Practice #1 Split a string line into words Input: string of words separated by space Output: Original input string One word per line, all character in upper case $ cat input Test my skill $./ssplit < input input: Test my skill TEST MY SKILL SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong (jinkyu@skku.edu) 14

15 Lab Practice #2 Print out n prime numbers Input: n (1 <= n <= 100) Check input value. If not the right range, ask again Output: n prime numbers $./nprimes How many [1..100]? Total 5 primes found! SSE2034: System Software Experiment 3, Fall 2018, Jinkyu Jeong (jinkyu@skku.edu) 15