c++ - 我是否以错误的方式声明了 getpriorityvalues 函数？

Question

我想将优先级值传递给主类和其他类，但是当我这样做时，我得到了错误的优先级值。我不知道哪一部分是错的，因为它对我来说看起来是正确的。当我运行代码时，它返回一个随机数作为优先级值。

#include <iostream>
#include <string>
using namespace std;

class Process {

private:
    int ID; //I decleare variables
    int priority;
    int arrivaltime;
    int runtime;

public:
    Process(int id = -1, int p = 4, int arr = 0, int run = 0); //initiliazing
    int getpriorityvalues();
};
//contsructor
Process::Process(int id, int p, int arr, int run)
{
    int ID = id;
    int priority = p;
    int arrivaltime = arr;
    int runtime = run;
    cout << ID;
    cout << priority; //returning priority variable
}
//function that I want to use for variable passing
int Process::getpriorityvalues()
{
    cout << priority;
    cout << ID;
    cout << arrivaltime;
    cout << runtime;
    return priority;
}

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

int main()
{

    Process A; //object A
    int b = A.getpriorityvalues(); //result is not -4
    cout << b; //it is random number

    return 0;
}

Answer 1

在你的构造函数中你没有初始化成员变量，你正在创建局部变量，这些变量在构造函数返回时被销毁。

在构造函数上使用初始化列表:

Process::Process (int id,int p,int arr,int run)
  : ID{id},
    priority{p},
    arrivaltime{ar},
    runtime{run}
{
    cout<< ID;   
    cout<<priority; //returning priority variable  
}