C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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printf Flags
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─────Run-Time Library───────────────────────────────────────────────────────
 
     The <flags> determine justification of output and control the
     printing of signs, blanks, decimal points, and octal and
     hexadecimal prefixes, as shown in the list below. More than one
     flag can appear in a format specification.
 
     Flag:                           See:
 
     Justification                   ◄- (hyphen)►
 
     Signs (+ and -)                 ◄+ (plus)►
 
     Leading zeros                   ◄0 (zero)►
 
     Leading blanks                  ◄' ' (blank)►
 
     Radix indicators (0x, etc.)     ◄# (pound sign)►
 
     Decimal points,                 ◄# (pound sign)►
     trailing zeros, etc.
                                    -♦-