C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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printf Prefixes
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─────Run-Time Library───────────────────────────────────────────────────────
 
     The F and N prefixes override the default addressing conventions
     of the memory model being used. They should be used only with
     pointers. These prefixes are not part of the ANSI definition.
 
     Prefix     Specifies
 
     F          far (32-bit address) pointer
     N          near (16-bit address) pointer
 
     The h, l, and L prefixes specify the size of the argument:
 
     Prefix     Used With         Specifies
 
     h          d, i, o, x, X     short int
                u                 short unsigned
     l          d, i, o, x, X     long int
                u                 long unsigned
                e, E, f, g, G     double
     L          e, E, f, g, G     long double
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