C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
printf Type Characters: Character
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─────Run-Time Library───────────────────────────────────────────────────────
 
     Character     Type       Output Format
 
     c             int        Single character
 
     s             string     Characters printed up to the first null
                              character (\0) or until the precision
                              value is reached
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