What is the argument for printf that formats a long

Question

The printf function takes an argument type  such as  d or  i for a signed int  However  I don t see anything for a long value

User · Accepted Answer

Put an l  lowercased letter L  directly before the specifier     unsigned long n  long m   printf   lu  ld   n  m

User · Answer

ld see printf reference on cplusplus com

User · Answer

In case you re looking to print unsigned long long as I was  use   unsigned long long n  printf   llu   n     For all other combinations  I believe you use the table from the printf manual  taking the row  then column label for whatever type you re trying to print  as I do with printf   llu   n  above

User · Answer

On most platforms  long and int are the same size  32 bits   Still  it does have its own format specifier   long n  unsigned long un  printf   ld   n      signed printf   lu   un      unsigned   For 64 bits  you d want a long long   long long n  unsigned long long un  printf   lld   n      signed printf   llu   un      unsigned   Oh  and of course  it s different in Windows   printf   l64d   n      signed printf   l64u   un      unsigned   Frequently  when I m printing 64-bit values  I find it helpful to print them in hex  usually with numbers that big  they are pointers or bit fields    unsigned long long n  printf  0x 016llX   n       0x  followed by  0-padded    16 char wide    long long    HEX with 0-9A-F    will print   0x00000000DEADBEEF   Btw   long  doesn t mean that much anymore  on mainstream x64     int  is the platform default int size  typically 32 bits    long  is usually the same size   However  they have different portability semantics on older platforms  and modern embedded platforms      long long  is a 64-bit number and usually what people meant to use unless they really really knew what they were doing editing a piece of x-platform portable code   Even then  they probably would have used a macro instead to capture the semantic meaning of the type  eg uint64 t    char c           8 bits short s          16 bits int i            32 bits  on modern platforms  long l           32 bits long long ll     64 bits    Back in the day   int  was 16 bits   You d think it would now be 64 bits  but no  that would have caused insane portability issues   Of course  even this is a simplification of the arcane and history-rich truth   See wiki Integer

User · Answer

I think you mean   unsigned long n  printf   lu   n        unsigned long   or  long n  printf   ld   n        signed long

User · Answer

It depends  if you are referring to unsigned long the formatting character is   lu    If you re referring to signed long the formatting character is   ld

User · Answer

I think to answer this question definitively would require knowing the compiler name and version that you are using and the platform  CPU type  OS etc   that it is compiling for

[c] What is the argument for printf that formats a long?

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