derived from https://github.com/Acejoy/LL-1-Parsing-Table-Calculator
g++ FIRST_FOLLOW_TABLE.cpp
$./a.out
Enter the filename wgich contains the grammar rules: p1
Enter the start symbol: E
the non terminals are:{ E E' F T T' }.
the terminals are:{ ( ) * + e id }.
N_TERMINAL | PRODUCTIONS
-----------------------------------
| E|T E',
| E'|+ T E',e,
| F|( E ),id,
| T|F T',
| T'|* F T',e,
-------------CALC FIRST SET----------------
....