Programming Reference/Librarys
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!long
Long variables are extended size variables for number storage, and store 32 bits (4 bytes), from -2,147,483,648 to 2,147,483,647.
long speedOfLight = 186000L; // see Integer Constants for explanation of the 'L'
[=long var = val;=]
*var - the long variable name *val - the value assigned to the variable
* byte * int * unsigned int * unsignedlong * Integer Constants * Variable Declaration
Source: arduino.cc