I am using clock function for my c program to print execution time of current program.I am getting wrong time in output.I want to display time in seconds,milliseconds and microseconds.

#include  
#include 
#include  
int main() 
{ 
    clock_t start = clock(); 
    sleep(3);
    clock_t end = clock(); 
    double time_taken = (double)(end - start)/CLOCKS_PER_SEC; // in seconds 

    printf("time program took %f seconds to execute \n", time_taken); 
    return 0; 
} 


time ./time
time program took 0.081000 seconds to execute
real    0m3.002s
user    0m0.000s
sys     0m0.002s

I expect output around 3 seconds however it display wrong. As you see if I run this program using Linux command time I am getting correct time,I want to display same time using my c program.