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

int *range(int start, int end, int step){
	size_t nitems = (end-start / step);
//	int *array = (int*)malloc(sizeof(int) * nitems);
	int *array = (int*)malloc(nitems);
	for(int i = start; i < end; i += step)
		array[i / step - 1] = i;

	/* 
	 * Suppose start = 3, end = 9, step = 3
	 * array[3/3 - 1] = 3
	 * array[6/3 - 1] = 6
	 * array[9/3 - 1] = 9
	 */
	return (int*)array;
}

int main(){
	int *r = range(3, 9, 3);
	printf("%d\n", r[0]);
	printf("%d\n", r[1]);
	free(r);
	return 0;
}