优化代码： double price = 0; F0计算价格 price= F0PriceitemCode supllierCode datetime; if price0 return price; F2计算价格

double price = F0Price(itemCode, supllierCode, datetime); if (price > 0) { return price; } price = F2Price(itemCode, supllierCode, datetime); if (price > 0) { return price; } price = F3Price(itemCode, supllierCode, datetime); return price;