php -r "var_dump(intval(0.58 * 100));”
int(57)
python3
>>>print(0.58*100)57.99999999999999
other languages http://0.30000000000000004.com
how did this happen http://www.laruence.com/2013/03/26/2884.html
Mathematical extensions in php and decimal module in python to avoid this
php -r "var_dump(intval(bcmul('0.58', '100')));"
int(58)
>>> from decimal import Decimal
>>> from decimal import getcontext
>>> print(Decimal('0.58') * Decimal('100'))
58.00