C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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difftime
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <time.h>
 
  Syntax:    double difftime( time_t timer1, time_t timer0 );
 
  Returns:   the difference in elapsed time between <timer0> and
             <timer1>.
 
  See also:  time, clock
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