C ++计算公交车每日利润(小错误?)

时间:2017-01-23 23:49:33

标签: c++ string char

我正在尝试用C ++解决一些编程练习(我是新手)。该练习需要计算公共汽车(公共交通)的每日利润,并打印出利润最高的公交车名称,以及每日利润和所有公交车的总利润之和。然而,根据乘客的不同,门票有不同的类型(1,2,3,4,5或6):1是满,满= 3,2为教师= 25.5,3为学生= 22.10和4,5 ,6是免费的。 这是我的代码:

#include <iostream>
#include <string.h>
#include <iomanip>

using namespace std;

int main()
{
    int n, j; 
    double full_ticket=0, teacher_ticket=0, std_ticket=0, foreign_ticket=0, polis_card=0, elderly_card=0; //declare tickets
    char ticket, c; 
    string bus, hBus; //declare strings for bus names
    double  fuel_amount, fuel_price, daily_profit,busProfit, hAmount, total_amount; 

    cin>>n>>fuel_price; 
    for (j=1;j<=n;j++) 
    {
        cin>>bus>>fuel_amount; //read string and amount of fuel consumed
        do
        {
            cin>>ticket>>c;  //read ticket type and c is comma, after each ticket there **needs** to be a comma
            if(ticket=='1')   
            {
                full_ticket=full_ticket+30;                 
                total_amount=total_amount+full_ticket;
            }
            if(ticket=='2')
            {
                teacher_ticket=teacher_ticket+25.5;             
                total_amount=total_amount+teacher_ticket;
            }
            if(ticket=='3')
            {
                std_ticket=std_ticket+22.10;                     
                total_amount=total_amount+std_ticket;
            }
            if(ticket=='4')
            {
                foreign_ticket=foreign_ticket+0;                    
                total_amount=total_amount+foreign_ticket;
            }
            if(ticket=='5')
            {
                polis_card=polis_card+0;                         
                total_amount=total_amount+polis_card;
            }
            if(ticket=='6')
            {
                elderly_card=elderly_card+0;                    
                total_amount=total_amount+elderly_card;
            }
        }while(c!=';'); //termination of do-while loop when it reads a semicolon


                    //calculate sum per each bus
        busProfit=(full_ticket+teacher_ticket+std_ticket+foreign_ticket+polis_card+elderly_card)-(fuel_amount*fuel_price);

        daily_profit=daily_profit+busProfit; //calculate daily profit of buses

        if(busProfit>hAmount) //set condition for highest bus
        {
            hAmount=busProfit;            
            hBus=bus;
        }


        full_ticket=0; teacher_ticket=0; std_ticket=0; foreign_ticket=0;polis_card=0;elderly_card=0;
        //set variables to 0 before loop starts again

    }

            cout<<fixed<<setprecision(2);       
            cout<<hBus<<" "<<hAmount<<endl;         //print highest bus and highest amount
            cout<<daily_profit;                     //print daily profit

    return 0;

}

这段代码似乎通过了所有初级测试,但由于它尚未被接受,因此它有问题。如果你能帮我找到错误,我将不胜感激。

1 个答案:

答案 0 :(得分:2)

两个问题,虽然第二个问题可能不相关,因为我认为除了计算之外没有使用total_amount

daily_profit在使用之前从未初始化。

total_amount的值对于以下内容不正确:

   if(ticket=='1')   
    {
        full_ticket=full_ticket+30;                 
        total_amount=total_amount+full_ticket;
    }

在上面的代码中,您要将full_ticket的费用添加到我假设的是您通过销售完整门票所赚取的总金额。然后,将该值添加到total_amount。问题是,你真的只想添加30到total_amount,因为你计算每次添加的每张票的价值,而不是一张票的价值。

第一张票:full_ticket = 30, total_amount = 30 第二张票:full_ticket = 60, total_amount = 90 第三张票:full_ticket = 90, total_amount = 180

这种模式会重复其他票价。