C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
printf Type Characters: Integer
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─────Run-Time Library───────────────────────────────────────────────────────
 
     Character   Type         Output Format
 
     d           int          Signed decimal integer
 
     i           int          Signed decimal integer
 
     u           int          Unsigned decimal integer
 
     o           int          Unsigned octal integer
 
     x           int          Unsigned hexadecimal integer, using
                              "abcdef"
 
     X           int          Unsigned hexadecimal integer, using
                              "ABCDEF"
 
     n           Ptr to int   Number of characters successfully written
                              so far to the stream or buffer; this
                              value is stored in the integer whose
                              address is given as the argument.
                                    -♦-