dynamic_array.c

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

typedef struct {
    int x;
    int y;
} Point;

int main(int argc, char *argv[])
{
    if (argc < 2) {
        assert(argc >= 1);
        fprintf(stderr, "Usage: %s <N>\n", argv[0]);
        exit(1);
    }

    int n = atoi(argv[1]);
    Point *points = malloc(sizeof(Point) * n);

    for (int i = 0; i < n; ++i) {
        points[i].x = i;
        points[i].y = i;
    }

    free(points);

    return 0;
}