assumed express followed as:
T->F|abcde
F->a|b|c|d|e|done!
now we want to get the FIRST of the T, do something followed as:
FIRST:
/*sign is the undeterminal of every express, every char array is used to store
the express, and use a char array to bring back the &rst of this express.
Besides, every express should have its own FIRST and this will be used when
you create the FOLLOW of undeterminal sign.
void &rst(char **sign, char **result)
{
int row, col;//the row and column of the array sign
int tr, tc;
}
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