The l of %ld means long. %ld means output in long int format (signed long integer format). General compilers %ld and %d are the same.

For example, MS VC++ 6.0, printf("%d ",3276899); Output 3276899.

{64-bit integer in MS VC++6.0, with _ _ int64x =12345678976; ; This variable

Output format is printf("%I64d ",x); }