Test function of time in C

#include <stdio.h> 
#include <time.h> 
#include <math.h> 

of clock_t Start, STOP;     // of clock_t of clock () Returns the variable type 
Double DURATION;         // record the measured function of time, to seconds 

int main ( int argc, char ** the argv) 
{ 
    / * no longer prepared to work in the test range of the write clock () before calling * / 

    // start timing 
    start = clock ();
     // was measured as a function 

    // stop the timer 
    sTOP = Clock ();
     // calculate runtime 
    DURATION = (( Double ) (sTOP - Start)) / CLOCKS_PER_SEC;

    / * Processing of other tests not written on the back of the range, for example, the value of the output duration * / 
    the printf ( " Running Time:. 6.2es% \ n- " , duration);
     return  0 ; 
}