Question

我是一名学生，我正在学习c ++。

这是我的cpp代码

int _tmain(int argc, _TCHAR* argv[])
{
    CFood output;   
    output.whatFunc();
    cout<<"my outputs"<<endl<<output<<endl;
    return 0;
}

ostream& operator <<(ostream& outputStream, const CFood& output)
{
    for(int i=0; i<2; i++)
   {
   outputStream <<"1 : "<<output.m_strName[i]<<" 2 : "<<output.m_servingSize[i]<<"g "<<"3 : "<<
      output.m_calorie[i]<<"cal "<<"4 : "<<output.m_transFat[i]<<"g"<<endl;

   }

    return outputStream;
}

当我调试它时，它工作。但是控制台的结束，它给了我错误信息;;;

它说＆＃34; work.exe发生了未处理的win32异常[5796]＆＃34;

我的标题是

class CFood
{
public:
    CFood(void);
    ~CFood(void);

private:
    string m_strName[7];
    double m_servingSize[7];
    double m_calorie[7];
   double m_transFat[7];

public:
    void whatFunc(void); 
friend ostream& operator <<(ostream& outputStream,const CFood& output);
}

我认为我的代码有问题......我认为它的CFood输出;（只是想......）

你知道为什么它有调试错误吗？

++对不起，我忘记了whatFunc（void）

这是代码

void CFood::whatFunc(void) //
{
   m_strName[0]="chicken";
   m_strName[1]="rice";
   m_strName[2]="meat";
   m_strName[3]="strawberry";
   m_strName[4]="apple";
   m_strName[5]="water";
   m_strName[6]="juice";
   m_servingSize[0]=10;
   m_servingSize[1]=20;
   m_servingSize[2]=30;
   m_servingSize[3]=40;
   m_servingSize[4]=50;
   m_servingSize[5]=60;
   m_servingSize[6]=70;
   m_calorie[0]=10.45;
   m_calorie[1]=20.57;
   m_calorie[2]=30.78;
   m_calorie[3]=40.23;
   m_calorie[4]=50.85;
   m_calorie[5]=60.73;
   m_calorie[6]=70.27;
   m_transFat[0]=0.01;
   m_transFat[1]=0.02;
   m_transFat[2]=0.03;
   m_transFat[3]=0.04;
   m_transFat[4]=0.05;
   m_transFat[5]=0.06;
   m_transFat[6]=0.07;



}

Answer 1

如果没有完整的源代码，很难说出究竟出了什么问题。在我的拙见中，整个来源都有很多不足之处。将明显链接的数据放置在具有静态大小的未链接数组中并不是一个非常好的模式。而是尝试这样的事情：

#include <iostream>
#include <vector>
#include <string>
#include <ostream>

struct CFoodItem{
    std::string m_strName;
    double m_servingSize;
    double m_calorie;
    double m_transFat;
};

class CFood
{
public:
    void AddFoodItem(const CFoodItem& cItem);
    friend std::ostream& operator <<(std::ostream& outputStream, const CFood& output);
private:
    std::vector<CFoodItem> m_vItems;
};


std::ostream& operator <<(std::ostream& outputStream, const CFood& output)
{
    for (auto i = output.m_vItems.begin(); i != output.m_vItems.end(); ++i)
    {
        outputStream << "1 : " << i->m_strName << " 2 : " << i->m_servingSize << "g " << "3 : " <<
            i->m_calorie << "cal " << "4 : " << i->m_transFat << "g" << std::endl;

    }

    return (outputStream);
}

void CFood::AddFoodItem(const CFoodItem& cItem)
{
    m_vItems.push_back(cItem);
}

int __cdecl main(void)
{
    CFood output;
    CFoodItem itm;
    itm.m_strName = "some food";
    itm.m_servingSize = 100500;
    itm.m_calorie = 42;
    itm.m_transFat = 42;
    output.AddFoodItem(itm);
    std::cout << "my outputs" << std::endl << output << std::endl;
    return 0;
}

控制台末尾的调试错误

1 个答案: