c timeSetClock

/*zusatzaufgabe1*/

#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <sys/time.h>
#include <unistd.h>

int main (int argc, char *argv[])
{
    clock_t clock(void);
    clock_t begin1, end1, begin2, end2;
    int i, j, n, *a,
    float z;

    srand((unsigned int) time(NULL));

    if(argc != 2)
    {
        printf("loop set: ");
        if(scanf("%d", &n) == 1)
        {
            printf("%d", n);
        }
        else
        {
            printf("failed to read integer");
        }
    }
    else
    {
        n = atoi(argv[1]);
        a = (int *) malloc (n * sizeof(int));
    }

    begin1 = clock();
    for (i = 0; i < n; ++i)
    {
        int r = rand() % n;
        a[r] = r;
    }
    end1 = clock();

    printf("begin loop1: %ld\n", (float)begin1);
    printf("end loop11: %ld\n", (float)end1);
    printf("clocks runtime: %ld\n", (float)(end1 - begin1));
    z = end1 - begin1;
    z = z / CLOCKS_PER_SEC;
    printf("time in seconds loop1: %ld\n", z);
/*--------------------------------------------------------end loop1*/
    begin2 = clock();
    for (j = 0; j < n; ++i)
    {
        int r = rand() % n;
        a[j] = r;
    }
    end2 = clock();

    printf("begin loop2: %ld\n", (float)begin1);
    printf("end loop2: %ld\n", (float)end2);
    printf("clocks runtime: %ld\n", (float)(end2 - begin1));

    z = end2 - begin1;
    z = z / CLOCKS_PER_SEC;
    printf("time in seconds loop2: %ld\n", z);
/*-------------------------------------------------------end loop2*/
    free(a);

    return 0;
}