\b;Instruction \c;extern\n;
The instruction \c;extern\n; determines which is the procedure which acts as main program. Declared procedure will have its name in the list of programs, below to the left of the window.
\c;
\s;extern void object::Boum( )
\s;{
\s;	while ( true )
\s;	{
\s;		fire(1);
\s;		turn(10);
\s;	}
\s;}
\n;
If the program use other procedures, only main procedure must be preceded with \c;extern\n;.
\c;
\s;extern void object::Square( )
\s;{
\s;	for ( int i=0 ; i<4 ; i++ )
\s;	{
\s;		Line(10);
\s;	}
\s;}
\s;
\s;void object::Line(float dist)
\s;{
\s;	move(dist);
\s;	turn(90);
\s;}
\n;
\t;See also
\l;Programming\u cbot;, \l;types\u cbot\type; and \l;categories\u cbot\category;.