[請益] C/C++ elapsed time..

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#include <ctime> //time.h

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double diffclock(clock_t clk, clock_t clk_end)
{
double diffticks = clk_end - clk;
double diffms = (diffticks*1000)/CLOCKS_PER_SEC;
return diffms;
}

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time_t start, end;
time(&start);
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time(&end);

double dif = difftime(end, start);

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