EE450 Discussion #2 A Brief Introduction to Software Development in C++Outline n (S)FTP Clients q learn how you can upload/download files to/from a server n X-Window Clients q learn how you can execute remote commands in a Unix server n Introduction to programming in C/C++(S)FTP Clients § To transfer files from/to your local machine to/from Nunki use any of the following § WinSCP, FileZilla (Windows) § Cyberduck, FileZilla, Fetch (Mac) § FileZilla (Linux) § or any other (S)FTP client, scp command, etc § See http://www.usc.edu/its/sftp/ for more details § WARNING: DO NOT delete any files you DID NOT create on the server! § You might not be able to execute commands correctly.(S)FTP Clients Cont’d… FileZilla See here: http://itservices.usc.edu/sftp/filezilla/File Editors n To remotely edit files (e.g. your C/C++ source code) on Nunki q you can either use file editors such as “emacs”, or “vi” that come with your UNIX environment n http://itservices.usc.edu/unix/editors/vi/ n http://itservices.usc.edu/unix/editors/emacsreference/ q or, you can use an editor from inside the (S)FTP client you use (easier) n Use either the default editor that each (S)FTP client comes with n Or, a third party editor that you can download and open from inside the (S)FTP client q Notepad++, Sublime Text (Windows) q Xcode, Sublime Text (Mac) q GEdit, Kate, KEdit, etc (Linux)How to connect Remotely to Nunki n To execute remote commands on Nunki: n If you use Windows q You need to download, install and run X-Win and VPN on your computer n Open software.usc.edu in you web browser n Login using your USC username and password n Select your operating system n Download the latest X-Win and VPN n Install them both on your computer n Check http://itservices.usc.edu/unix/xservers/xwin32 for more info n Run and login to VPN, run X-Win, configure an SSH session for nunki and login to nunki n If X-Win does not work on your machine (e.g. if you use Win 8), you can q download MobaXTerm from http://mobaxterm.mobatek.net/download-home-edition.html q Or download Putty from software.usc.edu n If you use Mac or Linux q Just use the pre-installed “Terminal” application instead of X-Win q Run the command: ssh –X [email protected] n WARNING: Don’t delete any files you did not create from the server!How to connect Remotely to Nunki Cont’d… n XwinHow to connect Remotely to Nunki Cont’d… n Select SShHow to connect Remotely to Nunki Cont’d… § Fill out as in shownHow to connect Remotely to Nunki Cont’d…How to connect Remotely to Nunki Cont’d… n The new connection will be added to you connection list under My Connections n Select the connection n Click on the Launch button. n Enter the Username and the passwordHow to connect Remotely to Nunki Cont’d… • Now you can execute your UNIX commandHow to connect Remotely to Nunki Cont’d… n Putty nunki.usc.edu!Introduction to C/C++Strategies for learning C++ n Focus on concepts and programming techniques (Don’t get lost in language features) n Learn C++ to become a better programmer q More effective at designing and implementing n C++ supports many different programming styles n Learn C++ gradually n Don’t have to know every detail of C++ to write a good C++ program n Implement full working examples to see how they work q See also here: http://www.cplusplus.com/doc/tutorial/In a Nutshell: “Hello World” in C++ n Our first program in C++: “Hello World” /* my first program in C++ with comments */ #include <iostream> using namespace std; int main () { cout << "Hello World! "; // prints Hello World! return 0; } n After you are connected to Nunki, create a text file named “hello.cpp”, and copy-paste the source code shown above n In the command line, run: g++ hello.cpp q This generates an executable a.out. It can be executed with ./a.out n Alternatively, run: g++ -o somename hello.cpp q Run it with ./somename !Comments n How to make comments: n In C: q a = a+ b; /* comment in C */ n In C++: q a = a + b; // line comment q a = a + b; /*block comment block comment block comment*/Variable declaration n In C: all variable definitions must occur at the beginning of a block. q Example: int i; for (i=0; i<5; i++) { ... } n In C++: variable definitions may occur at the point of use. q Example: for(int i=0; i<5; i++) { ... }Identifiers n C++ reserved keywords that can not be used as an identifier: n asm, auto, bool, break, case, catch, char, class, const, const_cast, continue, default, delete, do, double, dynamic_cast, else, enum, explicit, extern, false, float, for, friend, goto, if, inline, int, long, mutable, namespace, new, operator, private, protected, public, register, reinterpret_cast, return, short, signed, sizeof, static, static_cast, struct, switch, template, this, throw, true, try, typedef, typeid, typename, union, unsigned, using, virtual, void, volatile, wchar_t. n and, and_eq, bitand, bitor, compl, not, not_eq, or, or_eq, xor, xor_eq. n far, huge, near (for some compiler).Boolean n Built-in type bool: n In C: true is represented by nonzero integer values, and false by zero. n In C++: type bool is added to represent boolean values. A bool object can be assigned the literal value true and falseBoolean n Example: n int* f (int); n bool flag1, flag2; n flag1 = false; n flag2 = f(5); n A zero value or a null pointer value can be converted to false implicitly; all other values are converted to trueConstant n In C: Constants are handled by the preprocessor through macro substitution. q #define MAX 10 q #define MAX f(5) // wrong !Declared Constants n In C++: The keyword const allows explicit definition of constants objects. n // max and a cannot be modified after initialization n const int max = 10; n const int a = f(5); n