presently gcalctool not supporting indic numerals, but i think it will nice if we enable it for indic digit also, so if someone entered indic numerals for calculating it should do a calculations and display a result in indic numerals.
I googled for this but didn't found any topic related this.
now i dont know complexity involve in doing this, but as far as i think it will just require conversion from Indic numerals to Latin numerals and vice versa. When somebody enters any expression and if it contains indic numerals it will convert it to latin, then processing as usual and then while display result it will do same thing back.
1) understading gcalctool code
2) utf-8 to unicode conversion
3) validation for indic numerals
4) converting to latin before processing
5) converting result back to indic after processing
6) unciode to utf-8
hope so there is no any standard not allowing doing this thing :), i will talk with upstream for this lets see