Upon startup, program should prompt user for the folowing Please enter config filename : config.txtWhen user presses 'Enter, the program should perform File I$/$O ot read ni the contents ni the stated filename $($e$.$g$.$ ni this case 'config. txt$\text{'})$The config.txt contains data like size of grid$-$map area $($indicated by index$-$ranges$),$ as wel as a series of filenames, which your program should further access, ni order to read ni the various relevant weather data provided by the Meteorological Station. Figure A$-1$ below provides a sample of the actual contents within this configuration file.