C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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printf Format Specification
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     A format specification has the following form:
 
          %[flags][width][.precision][prefix]type
 
     Each optional field of the format specification is a single
     character or a number signifying a format option. These fields
     control width and other aspects of formatting.
     See: ◄Flags► ◄Width► ◄Precision► ◄Prefix►
 
     The type character, which appears after the last optional format
     field, determines whether the associated argument is interpreted
     as a character, string, or number.
     See: ◄Type►
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