C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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printf Flags: Leading Zeros
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─────Run-Time Library───────────────────────────────────────────────────────
 
     Flag     Meaning
 
     0        Write zeros until a minimum width is reached. If 0 and
              - appear, the 0 is ignored. If 0 is specified with an
              integer format (i, u, x, X, o, d), the 0 is ignored. The
              default is no padding.
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