Question

这是我的主要功能

#include <iostream>
#include "FlyingPoints.h"

using namespace std;

void read(const char* msg, FlyingPoints& f)
{
    int inPoints, outPoints;
    cout << "Enter " << msg << endl;
    cout << "Enter number of incoming flying points: ";
    cin >> inPoints;
    cout << "Enter number of spent flying points: ";
    cin >> outPoints;
    f = FlyingPoints(inPoints, outPoints);
}
int main()
{
    FlyingPoints left, right, result, ref;

    cout << "Flying Points Calculator\n";
    cout << "========================\n";

    read("Left Operand...", left);
    read("Right Operand...", right);

    cout << "Result: " << endl;
    left.display();
    cout << " + ";
    right.display();
    cout << " = ";
    result = left + right;
    result.display();
    cout << endl;

    read("2nd Right Operand...", right);

    cout << "Result: " << endl;
    result.display();
    cout << " += ";
    right.display();
    cout <<  " => ";
    result += right;
    result.display();
    cout << endl;

    read("Reference...", ref);
    if (result == ref){
        cout << "Result == Reference" << endl;
    } else {
        cout << "Result != Reference" << endl;
    }
    return 0;
}

头文件

  class FlyingPoints{
    int inPoints;
    int outPoints;
    void updatebalance();
    public:
    FlyingPoints();
    FlyingPoints(int, int);
    void display();
    FlyingPoints& operator+=(const FlyingPoints&);
    friend bool operator==(const FlyingPoints&, const FlyingPoints&);
};
    FlyingPoints operator+(const FlyingPoints&, const FlyingPoints&);

和.cpp文件

#include <iostream>
#include "FlyingPoints.h"
using namespace std;

void FlyingPoints::updatebalance(){
    if(inPoints > outPoints){
        inPoints = inPoints - outPoints;
        outPoints = 0;
    }else{
        outPoints = inPoints - outPoints;
        inPoints = 0;   
    }
}
FlyingPoints::FlyingPoints(){
    inPoints = 0;
    outPoints = 0;
}
FlyingPoints::FlyingPoints(int in, int out){
    inPoints = in;
    outPoints = out;
}
void FlyingPoints::display(){
    cout << inPoints << " points available to fly." << outPoints << "      points spent." << endl;
}
FlyingPoints& FlyingPoints::operator+=(const FlyingPoints& f){
    inPoints += f.inPoints;
    outPoints += f.outPoints;
    updatebalance();
    return *this;//why do we return this?*this refers to the operator?
}
FlyingPoints operator+(const FlyingPoints& a, const FlyingPoints& b){
    //inPoints = a.inPoints + b.inPoints;
    //outPoints = a.outPoints + b.outpoints;    
    return a + b;
}
bool operator==(const FlyingPoints& first, const FlyingPoints& second){
    if(first.inPoints == second.inPoints && first.outPoints == second.outPoints){
        return true;
    } else {
        return false;
    }
}

当我跑步时会发生这种情况。飞点计算器

======================== 输入左操作数......

输入传入飞行点数：500

输入用完的飞行点数：300

输入右操作数...

输入传入飞行点数：200

输入用完的飞行点数：100

结果：

500点可用于飞行.3点花费。

200分可用于飞行。花费100点。

分段错误

我似乎无法分辨这个分段错误来自哪里，可以

有人帮忙吗？ cout可能是原因吗？ - 谢谢

Answer 1

问题的原因是operator+()无条件地调用自身，因此无限递归。

引用OP。

FlyingPoints operator+(const FlyingPoints& a, const FlyingPoints& b){
    //inPoints = a.inPoints + b.inPoints;
    //outPoints = a.outPoints + b.outpoints;    
    return a + b;
}

什么是可能的分段故障原因？

1 个答案: