GNU Octave

Time for action – writing a "Hello World" program

1. Let us try to implement the classical "Hello World" program. Open your editor and type in the following lines of code:

   Code Listing 8.1
   #include <octave/oct.h>                                           #1
   									#2
   DEFUN_DLD(hello, argv, , “Usage: hello()"){			        #3
     octave_value_list retval;					        #4
     									#5
     octave_stdout << "Hello World\n"; 				#6
   									#7
     return retval;							#8
   }									#9

2. Save the file as hello.cc in your working directory. At the Octave prompt, type in the following command:

   octave:10> mkoctfile hello.cc
   

   This compiles the C++ code.

3. Make a call to the function, which is then dynamically linked to the Octave environment:

   octave:11> hello()
   
   Hello World
   

What just happened?

To use the C++ interface and library, we need to include the header oct.h, which is done in ...