Calculating the execution time in C

#include<stdio.h>
#include<time.h>
     void myfun()
{
printf("hi.....");
}             
int main()
{
    clock_t t2,t1=clock();
 myfun();
t2=clock();
printf("the time difference in seconds is:%d",(t2-t1)/CLOCKS_PER_SEC);
return 0;
}        


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