Array permutation

perm.c

/*
 * perm.c
 *
 * Array permutation
 */
 
#include <assert.h>
#include <stdio.h>
#include <time.h>
#include <stdlib.h>

int main(int argc, char ** argv)
{
        assert(argc == 2);
        int n = atoi(argv[1]);
        assert(n != 0);
        srand(time(NULL));
        unsigned int *array = malloc(sizeof(int)*n);
        assert(array);
        for (int i = 0; i < n; ++i)
                array[i] = i;
        for (int i = n - 1; i > 0; --i) {
                int j = rand() % i;
                int tmp = array[j];
                array[j] = array[i];
                array[i] = tmp;
        }
        for (int i = 0; i < n; ++i)
                printf("[%d] = %d\n", i, array[i]);
}