The long keyword is an integral type.
Range: –9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
Size: Signed 64-bit integer
Example:
long l = 21321321321;
long l1 = 21321321321L; // using suffix L
int i = 100L; // Error: Error 1 Cannot implicitly convert type 'long' to 'int'. An explicit conversion exists (are you missing a cast?)
int x = (int)100L; // OK
