memmove for vector

memmove.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int
main(int argc, char* argv[]) {
    int i, n;
    double *x;
    n = 5;
    x = (double *)malloc(n * sizeof(double));
    for (i = 0; i < n; ++i)
    {
        x[i] = i + 1.123456;
    }

    memmove(x, x + 1, (n - 1) * sizeof(double));
    for (i = 0; i < n; ++i)
    {
        printf("%f\n", x[i]);
    }
    free(x);
    return 0;
}