int BuyItem() {
    //ShopSelection
    //ShopQuantity
    //CurrentMonth
    int i;
    int Cost;
    // 0 - 9 for Spring.
    // 10 - 21 for Summer.
    // 22 - 32 for Autumn.
    if(InventorySlotTwelve != 0) {
        if(CurrentMonth == 1) {
            i = 0;
        }
        else if(CurrentMonth == 2) {
            i = 10;
        }
        else if(CurrentMonth == 3) {
            i = 22;
        }
        i = ShopSelection + i;
        // GoldCalculation();
        Cost = AllCrops[i].Seeds * ShopQuantity;
        if(CurrentGold >= Cost) {
            strncpy(InventorySlotTwelve.ItemName, AllCrops[i].InventoryText, 14);
            InventorySlotTwelve.ItemQuantity = ShopQuantity;
            CurrentGold = CurrentGold - Cost;
            StackInventoryItems();
        }
        else {
            // 'You don't have enough money!' here.
        }
    else {
        // 'Full inventory!' here.
    }
    return 0;
}