Thread: Get time in nanoseconds

Hello


The following code calculates the values in nanoseconds:

Code:

         for(int i=1; i<=39; i++){
             long startTime = java.lang.System.nanoTime();         
             System.out.println("Hello world");
             long endTime = java.lang.System.nanoTime();
             System.out.println((endTime - startTime)); 
         }

I would like to do the same in C:
There are some code examples in the internet such as:

Code:

#include <sys/time.h>
#include <stdio.h>
#include <unistd.h>
int main()
{
    struct timeval start, end;
    long mtime, seconds, useconds;

    for(int sx=1; sx<=39; sx++){

        gettimeofday(&start, NULL);
        printf("Hello world");
        gettimeofday(&end, NULL);

        printf("Elapsed time: %ld microsecons\n", end.tv_usec - start.tv_usec);

     }

    return 0;
}

Unfortunately this returns a 0 microseconds value. And a multiplication of 1000 doesn't change at all.

Can anyone help please?

Thx,
Troix