C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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printf Flags: Signs
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─────Run-Time Library───────────────────────────────────────────────────────
 
     Flag     Meaning
 
     +        Prefix output value with sign (+ or -) if output is of
              signed type. By default, a sign appears only for negative
              signed values (-).
                                    -♦-