WTFC

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

#define ASIZE 100000
#define ITERS 5000

int prdel[ASIZE];

double get_time(void) {
    struct timeval tv;

    gettimeofday(&tv, NULL);
    return (double)tv.tv_sec + (double)tv.tv_usec/1000000.0;
}

int cmp_ints(const void * a, const void * b) {
    return *(int*)a<*(int*)b ? -1 : (*(int*)a==*(int *)b ? 0 : 1);
}


int main(int argc, char * argv[]) {


    int i,j;
    double start, finish;
    long sum = 0;

    srand(1337);

    for (i = 0; i < ASIZE; i++) {
        prdel[i] = rand();
    }

    // Fill array with random numbers
    for (i = 0; i < ASIZE; i++) {
        prdel[i] = rand();
    }

    start = get_time();

    // If WTF specified on the cmdline, sort the array
    if (argc == 2 && !strcmp(argv[1], "WTF")) {
        qsort(prdel, ASIZE, sizeof(int), cmp_ints);
    }

    // calculate sum of all "large" numbers in the array, repeat a couple of times.
    for(j = 0; j < ITERS; j++) {
        for(i = 0; i < ASIZE; i++) {
            if (prdel[i] >= RAND_MAX/2) {
                sum += prdel[i];
            }
        }
    }
    finish = get_time();

    // print result and time taken
    printf("Sum: %ld\nTime: %g\n", sum, finish - start);

    return 0;
}