(Minimal)
                            (Minimal)
                           (Practical)
                           (Practical)
        Introduction to C++ and OOP
         Introduction to C++ and OOP
                       For use in the Geant4 course
                            Largely incomplete
              Not meant to replace good C++, UML, and OOP books!
       Maria Grazia Pia
                              C++ basics 
                              C++ basics 
                  C++ is not an object oriented language
                             A “superset” of C
                   You can write procedural code in C++ 
        Maria Grazia Pia
                                                                  // my first program in C++
                Getting started #include 
                Getting started intmain () 
                                                                  { 
                                                                   std::cout << "Hello World!"; 
                                                                   return 0; 
                                                                  } 
          // This is a comment line
                        comment                             cout << "Hello World";
                                                                 •   C++ statement
          #include                                     •   cout is declared in the iostream
                •   directive for the preprocessor
                                        preprocessor                 standard file within the std namespace
         int main ()                                             •cin
               •   beginning of the definition of                •   semicolon (;) marks the end of the 
                   the                                               statement
                       main function
                       main function
               •   the main function is the point           return 0;
                   by where all C++ programs                     •   the return statement causes the main 
                   start their execution                             function to finish
               •   all C++ programs must have                    •   return may be followed by a return 
                   a main function                                   code (here: 0) 
               •   body enclosed in braces {}                          ¾return code 0 for the main function is generally 
            Maria Grazia Pia                                              interpreted as the program worked OK
        Compilation
        Compilation
                                 make myFirstProgram
        Preprocessor                  Compiler
        Inlines #includes etc.   Translates into machine code
                                 Associates calls with functions
                                      Object files
               Executable               Linker
            myFirstProgram     Associates functions with definitions 
                     External Libraries, libc.so, libcs123.so
       Maria Grazia Pia