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executable file 21 lines (17 sloc) 356 Bytes
#include <stdio.h>
#include <time.h>
void main()
clock_t start, end;
double t;
volatile int i;
int i;
start = clock();
for (i = 0; i < 0x3FFFFFFF; i++);
end = clock();
t = ((double) (end - start)) / CLOCKS_PER_SEC;
printf("time used %f\n",t);
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