LinuxQuestions.org - Still need help with timer

This is my code:

Code:

/*****************************************************************/

/* CS 2350 Spring 2007                                                                                        */

/* C section for Assignment 5                                    */

/************************ include files **************************/

//65-90 97-122

#include <stdio.h>

#include <stdlib.h>

#include <time.h>



//#define CLOCKS_PER_SEC 1000



//External functions/variables

extern "C" void lexsort(char*,char*);

//Global functions/variables

int COUNT;

int ITER  = 0;



int main(void)

{

        putchar('\n');

        putchar(':');

        scanf("%d", &COUNT);

        //random-related statements/variables

        srand(time(0));

        int ran;



    char* input = new char[COUNT+1];

        char* output = new char[COUNT+1];        

        output[COUNT] = NULL;

        input[COUNT] = NULL;



        //time-related variables

        struct timeval before, after;

        double diff;

        int x = 0;



        while(x < COUNT)

        {

                ran = rand() % 57 + 65;

                if(ran > 90 && ran < 122)

                        continue;

                else

                {

                        input[x++] = ran;

                }

        }



        printf("input = %s\n\n", input);

        //implement lexsort function



        gettimeofday(&before, 0);

        lexsort(input, output);

        gettimeofday(&after, 0);

        //diff = after.tv_nsec - before.tv_nsec;

        

        //output results

        printf("output = %s\n", output);

        printf("Time to implement: %d", after.tv_usec);

        printf("\nbefore = %d", before.tv_usec);



        return 0;

}

Now, I really don't think my computer is fast enough to do a function in under 1 microsecond, (2.8 P4), but if thats the case, then I need a nanosecond timer.