#include <stdio.h>

int *grow_array(int *inarr, int *currsize, int newsize);
int getval_array(int *inarr, int index);
int setval_array(int *inarr, int idx, int val);
int clear_array(int *inarr);
int print_array(int *inarr, int size);


main() {
  int *myarray;
  int arraysize;
  int done=0, idx, val, choice;

  arraysize = 0;
  myarray = NULL;

  while(!done) {
    
    printf("\n\n1 -- print array\n");
    printf("2 -- get val from array\n");
    printf("3 -- set val in array\n");
    printf("4 -- clear array\n");
    printf("5 -- exit\n");
    printf("Enter Menu Option: ");
    scanf("%d", &choice);
    printf("---------------------------\n");
    switch(choice) {
    case 1:
      print_array(myarray, arraysize);
      break;
    case 2:
      printf("Enter idx: ");
      scanf("%d", &idx);
      if (idx < arraysize && idx >= 0) {
	val = getval_array(myarray, idx);
	printf("val=%d\n", val);
      } else {
	printf("invalid index\n");
      }
      break;
    case 3:
      printf("Enter idx and val to add (i,v): ");
      scanf("%d,%d", &idx, &val);

      if (idx >= arraysize) {
	myarray = grow_array(myarray, &arraysize, idx+1);
      }

      setval_array(myarray, idx, val);

      break;
    case 4:
      clear_array(myarray);
      arraysize = 0;
      break;
    case 5:
      exit(0);
      break;
    }
    

  }

}

int clear_array(int *inarr) {
  free(inarr);
  return(0);
}

int *grow_array(int *inarr, int *currsize, int newsize) {
  int *temp;

  temp = (int *)malloc(sizeof(int)*newsize);
  bzero(temp, newsize);

  memcpy(temp, inarr, sizeof(int) * *currsize);
  free(inarr);

  *currsize = newsize;

  return(temp);

}

int setval_array(int *inarr, int idx, int val) {
  
  inarr[idx] = val;

  return(0);
}

int getval_array(int *inarr, int idx) {
  
  return(inarr[idx]);

}

int print_array(int *inarr, int size) {
  int i;

  printf("Current Array Contents: ");
  for (i=0; i<size; i++) {
    printf("%d ", inarr[i]);
  }
  printf("\n");

  return(0);
}