type LongInt { built-in type }
LongInt is a signed integer type which is longer than Integer. On some platforms it is 64 bits wide and thus has a range of -9223372036854775808 .. 9223372036854775807.
LongInt in GNU Pascal is compatible to long long int in GNU C.
There are lots of other integer types in GPC, see Integer Types.
LongInt is a Borland Pascal extension. Borland Pascal defines LongInt as a 32-bit signed integer type (Integer in GNU Pascal).
program LongIntDemo; var a: LongInt; begin a := 42; WriteLn (a) end.