How to Storage "long" and "float" variables

Please help me.I am new at arduino programming and I don't know how to storage "long" and "float" variables

Where do you want to store them, how long for and how many of them are to be stored ?

... and with power or without?

If what you mean is "I want to persistently store some values so that they are kept when the board is powered off", you can use EEPROM. The docs are here: Arduino - EEPROM.

The library provides a 'get' and 'put' function which will deal with primitive types of different lengths.