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c:time.h:clock [2013/01/22 22:02] (current)
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 +{{keywords>wiki library source code example reference}}
 +===== clock =====
 +   
 +<code c>
 +    clock_t clock(void);
 +</code>
 +
 +
 +=== Description ===
 +
 +The clock() function returns the processor time since the program started, or -1 if that information is unavailable.\\
 +To convert the return value to seconds, divide it by CLOCKS_PER_SEC. (Note: if your compiler is POSIX compliant, then CLOCKS_PER_SEC is always defined as 1000000.)
 +
 +    
 +===== clock c example =====
 +<code c>
 +/* 
 + * clock example code
 + * http://code-reference.com/c/time.h/clock 
 + */
 +#include <stdio.h>
 +#include <time.h>
 + 
 +int main (void)
 +{
 +   int sec = 5;
 +   clock_t end = clock() + sec * CLOCKS_PER_SEC;
 + 
 +   while (clock() < end) 
 +   {
 +     // do something
 +   }
 + 
 +   return 0;
 +}
 +
 +</code>
 +
 +or
 +
 +<code c>
 +/* 
 + * clock example code
 + * http://code-reference.com/c/time.h/clock 
 + */
 +#include <stdio.h>
 +#include <time.h>
 +int main( void )
 +{
 +  clock_t start = clock();
 +  clock_t finish;
 +  int i;
 +
 +  for (i = 0; i < 9999; ++i) {
 +    printf("%i\n", i);
 +  }
 +  
 +  finish = clock();
 +
 +  printf("executed \"printf\" %i times\nCocks per Sec: %li\nStart: %li\nFinish: %li\n",i ,  CLOCKS_PER_SEC, start, finish);
 +  return 0;
 +}
 +
 +</code>
 +
 +=== output ===
 +    executed "printf" 9999 times
 +    Cocks per Sec: 1000000
 +    Start: 0
 +    Finish: 20000
 +
 +
 +==== see also ====
 +[[c:time.h:time|time()]] [[c:time.h:difftime|difftime()]]
 +
  
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c/time.h/clock.txt · Last modified: 2013/01/22 22:02 (external edit)

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