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

// Returns an array containing [n, n + 1, ... , m - 1, m]. If n > m, then the
// array returned is []. If an error occurs, NULL is returned.

int* rangeArray(int n, int m);

int main(int argc, char** argv) {
  if (argc != 3) return EXIT_FAILURE;
  int n = atoi(argv[1]), m = atoi(argv[2]);  // Parse cmd-line args
  int* nums = rangeArray(n, m);

  // Print the resulting array
  for (int i = 0; i <= (m - n + 1); i++) {
    printf("%d ", nums[i]);
  }

  // Append newline char to our output
  puts("");

  return EXIT_SUCCESS;
}

int* rangeArray(int n, int m) {
  int length = m - n + 1;

  // Heap allocate the array needed to return
  int* array = (int*) malloc(sizeof(int) * length);

  // Initialized the elements
  for (int i = 0; i <= length; i++) {
    array[i] = i + n;
  }

  return array;
}