volatile uint32_t inventory = 100;
volatile uint32_t retailCount = 10;

void retailTask(void* pvParam)
{
  while(true)
  {
    uint32_t inv = inventory;
    for(int i=0; i<random(10, 100); i++)
      vTaskDelay(pdMS_TO_TICKS(i));

    if(inventory > 0)
    {
      inventory = inv - 1;
      retailCount++;
    }
  }
  vTaskDelay(10);
}

void showTask(void* pvParam)
{
  while(true)
  {
    printf("Inventory: %d\n", inventory);
    printf("  Retail : %d\n", retailCount);

    if (inventory == 0 ) {
      printf("\n-----SALES SUMMARY-----\n");
      printf("  Total Sales:  %d\n\n", retailCount);
    }

    vTaskDelay(pdMS_TO_TICKS(100));
  }
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

  xTaskCreate(retailTask, "Online Channel", 1024 * 4, NULL, 1, NULL);
  xTaskCreate(showTask, "Display Inventory", 1024 * 4, NULL, 1, NULL);  
}

void loop() {
  // put your main code here, to run repeatedly:
  
}