C++ 购物车代码 简易版1.0

一个简单的购物车代码，仅支持名字查找删除，一次只能操作购物车里的一个商品

总结：

1.每5行代码就要进行一下测试

2.基础知识要熟练牢靠

//good.h#ifndef _GOOD_H#define _GOOD_H#include <string>using std::string;class good{private:string goodname; //唯一标识商品double price; //价格double rate; //折扣率public:good(){ //无参构造函数goodname = "";price = 0.0;rate = 1.0;}good(string s, double p){//无折扣率构造函数goodname = s;price = p;rate = 1.0;}good(string s, double p, double r){//有折扣率构造函数goodname = s;price = p;rate = r;}string getGoodname()const {return goodname;}double getPrice()const{return price;}double getRate()const {return rate;}void setGoodname(string const name){goodname = name;}void setPrice(const double p){price = p;}void setRate(const double r){rate = r;}};#endif

//**************************************//版本：简易版2.0//作者：snowboy//释：//此版本函数一次只操作购物车中的一个商品//此版本函数仅提供通过商品名字的删除操作//***************************************//cart.h#ifndef _CART_H#define _CART_H#include "good.h"#include <vector>#include <iostream>using std::cout;using std::endl;struct item{ //存放商品及其数量good g;int amount;};class cart{private:std::vector<struct item> glist;//订单列表public:cart(){}void add(good g);//添加商品void deleteByGoodname(string goodname);//删除商品double total();void display();//购物列表展示double changeTotal();//TODO,改变总价void changeRateByGoodname(string);//TODO,改变商品折扣率void changPriceByGoodname(string);//TODO,改变商品价格};void cart::add(good g){std::vector<struct item>::iterator iter=glist.begin();for(;iter!=glist.end();++iter){if(iter->g.getGoodname() == g.getGoodname()){(*iter).amount++;return;}}item t;t.g = g;t.amount = 1;glist.push_back(t);}void cart::deleteByGoodname(string goodname){//按名字删除一个商品std::vector<struct item>::iterator iter=glist.begin();for(;iter!=glist.end();++iter){if(iter->g.getGoodname() == goodname){iter->amount--;if(iter->amount == 0){glist.erase(iter);}return;}}cout<<"no this good"<<endl;}void cart::display(){cout<<"********* good list *********"<<endl;if(glist.size()){std::vector<struct item>::const_iterator iter=glist.begin();for(;iter!=glist.end();++iter){cout<<"goodname: "<<iter->g.getGoodname()<<endl<<"price   : "<<iter->g.getPrice()<<endl<<"rate    : "<<iter->g.getRate()*100<<"%"<<endl<<"amount  : "<<iter->amount<<endl<<"total:  : "<<total()<<endl<<endl;}}else{cout<<"empty list"<<endl<<endl;}}double cart::total(){if(glist.size()){std::vector<struct item>::const_iterator iter=glist.begin();double sum=0.0;for(;iter!=glist.end();++iter){sum += iter->g.getPrice() * iter->g.getRate() * iter->amount;}return sum;}return 0;}#endif

//test.cpp#include "cart.h"int main(){good g("apple", 76);cart c;c.display();c.add(g);c.display();c.add(g);c.display();c.deleteByGoodname(g.getGoodname());c.display();c.deleteByGoodname(g.getGoodname());c.display();c.deleteByGoodname(g.getGoodname());c.display();c.deleteByGoodname(g.getGoodname());c.display();return 0;}