Question

请查看以下代码

#include <iostream>
#include <iomanip>
#include <vector>

using namespace std;

int static carNumber = 1; //Counts the car number
static int vectorLocation = 0; // used to get the vector location
double total=0; // total amount of charges

vector<double>hoursVector; //tracks each car's parkes hour
vector<double>chargeVector; //tracks each charge
vector<int>carVector; //tracks each car number


double calculateCharge(double numberOfHours);
void printData();
void insertIntoVector(double hours, double charges);

int main()
{
    cout << "Start entering data. -1 to exit \n\n " << endl;
    double numberOfHours=0;

    while(true)
    {
        cout << "Enter Number Of Hours"<< endl;
        cin >> numberOfHours;

        if(numberOfHours==-1)
        {
            break;
        }
        else
        {
            total = total + calculateCharge(numberOfHours);
        }
    }

    printData();

}



//This code will calculate the charge values

double calculateCharge(double numberOfHours)
{

    double charge = 0;
    double extraHours = 0;
    double extraCharge = 0;



    if(numberOfHours<=3)
    {
        charge = 2;
        insertIntoVector( numberOfHours, charge);
    }
    else if(numberOfHours>3 && numberOfHours<24)
    {
        extraHours = numberOfHours-3;
        extraCharge = extraHours * 0.5;

        charge = 2+extraCharge;

        insertIntoVector( numberOfHours, charge);
    }
    else if(numberOfHours==24)
    {
        charge = 10;

        insertIntoVector( numberOfHours, charge);
    }
    else if(numberOfHours>24)
    {
        charge = 0;

        insertIntoVector( numberOfHours, charge);
    }

    return charge;


}


//This code is used to enter data into vectors
void insertIntoVector(double hours, double charges)
{
    hoursVector[vectorLocation] = hours;
    chargeVector[vectorLocation] = charges;
    carVector[vectorLocation] = carNumber++;

    vectorLocation++;
    carNumber++;
}


//This method is used to print data
void printData()
{
    cout << "Car"<< setw(6)<< "Hours" << setw(6) << "Charge" << endl;

    for(size_t i=0;i<hoursVector.size();i++)
    {
        cout << carVector[i] << setprecision(2) << fixed << setw(6) << hoursVector[i] << setw(6) << chargeVector[i] << endl;
    }
}

在这里，在while循环中给出1个数据后，程序终止给出错误

RUN FAILED（退出值1，总时间：5秒）

我无法理解为什么。我是C ++的新手并且是我自己学习的。请帮我纠正这段代码并运行它没有问题。

Answer 1

问题是

hoursVector[vectorLocation] = hours;
chargeVector[vectorLocation] = charges;
carVector[vectorLocation] = carNumber++;

元素尚不存在。您必须使用push_back动态增大向量的大小。

Answer 2

hoursVector[vectorLocation] = hours;
chargeVector[vectorLocation] = charges;
carVector[vectorLocation] = carNumber++;
vectorLocation++;

插入向量是无效的方法。你应该这样做：

hoursVector.push_back( hours );
chargeVector.push_back( charges );
carVector.push_back( carNumber++ );

std :: vector本身保存有关他分配的内存块的信息;块大小;当前存储的数据大小等。在需要时，它会扩展内存块以允许您推送新值。因此，当您使用索引时，您只需耗尽已分配的内存块（在本例中）。无论如何，将值添加到vector中都是无效的方法，因此必须使用匹配方法替换。请参阅link以获取有关std :: vector方法的帮助。

运行失败，没有任何异常

2 个答案: