What is the format specifier for unsigned short int

Question

I have the following program    include  lt stdio h gt   int main void        unsigned short int length   10        printf  Enter length           scanf   u    amp length        printf  value is  u  n   length        return 0      Which when compiled using gcc filename c issued the following warning  in the scanf   line     warning  format     u    expects argument of type    unsigned int       but argument 2 has type    short unsigned int       -Wformat   I then referred the C99 specification - 7 19 6 Formatted input output functions and couldn t understand the correct format specifier when using the length modifiers  like short  long  etc  with unsigned for int data type   Is  u the correct specifier unsigned short int  If so why am I getting the above mentioned warning     EDIT   Most of the time  I was trying  uh and it was still giving the warning

User · Answer

For scanf  you need to use  hu since you re passing a pointer to an unsigned short  For printf  it s impossible to pass an unsigned short due to default promotions  it will be promoted to int or unsigned int depending on whether int has at least as many value bits as unsigned short or not  so  d or  u is fine  You re free to use  hu if you prefer  though

User · Answer

Here is a good table for printf specifiers  So it should be  hu for unsigned short int   And link to Wikipedia  C data types  too

User · Answer

Try using the   h  modifier   scanf   hu    amp length                  ISO IEC 9899 201x - 7 21 6 1-7      Specifies that a following d   i   o   u   x   X   or n conversion   specifier applies to an argument with type pointer to short or   unsigned short

User · Answer

From the Linux manual page    h      A  following  integer conversion corresponds to a short int or unsigned short int argument  or a fol-        lowing n conversion corresponds to a pointer to a short int argument    So to print an unsigned short integer  the format string should be   hu

[c] What is the format specifier for unsigned short int?

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