float : added sum and substraction function

float : added sum and substraction function

    it works nigga!

Signed-off-by: Oscar Jahaziel Acosta Mendoza <coca_lp@hotmail.com>
float : changed mantissa print format

float : changed mantissa print format

    its betta nigga!

Signed-off-by: Oscar Jahaziel Acosta Mendoza <coca_lp@hotmail.com>