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# Mainly Easy

(`main.cpp`.)

        #include <tqapplication.h>
        #include "chartform.h"

        int main( int argc, char *argv[] )
        {
            TQApplication app( argc, argv );

            TQString filename;
            if ( app.argc() > 1 ) {
                filename = app.argv()[1];
                if ( !filename.endsWith( ".cht" ) )
                    filename = TQString::null;
            }

            ChartForm *cf = new ChartForm( filename );
            app.setMainWidget( cf );
            cf->show();

            return app.exec();
        }

We have kept the main() function simple and small. We create a TQApplication object and pass it the command line arguments. We are allowing users to invoke the program with `chart mychart.cht`, so if they've added a filename we pass that through to the chart form constructor. Most of the action takes place within the chart form which we'll review next.

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