完成给出的部分代码，它将实现以下任务：
1 用单独的函数初始化时，分，秒
2 按给定的格式 hh:mm:ss 显示时间

class Time
{
  int hour;
  int minute;
  int second;
  public:
  Time()
  {
    hour = 0;
    minute = 0;
    second = 0;
  }
  Time(int hour; int minute = 0; int second = 0)
  {
    hour = hour;
    minute = minute;
    second = second;
  }
  void setTime()
  {
   
  }
};

int main()
{
  Time time;
  time.setTime(12,30,50);
  time.display();
  time.setTime(35);
  time.display();
  time.setTime(42,31);
  time.display();
}

看看我这样行不行
#include<iostream>
#include<stdlib.h>
using namespace std;

class Time
{
  int hour;
  int minute;
  int second;
  public:
  Time()
  {
    hour = 0;
    minute = 0;
    second = 0;
  }
  Time(int hour, int minute = 0, int second = 0)
  {
    hour = hour;
    minute = minute;
    second = second;
  }
  void setTime(int x,int y,int z)
  {
    hour = x;
    minute = y;
    second = z;
  }
  void setTime(int x,int y)
  {
   
    minute = x;
    second = y;
  }
  void setTime(int x)
  {
   
    second = x;
  }
  void display()
  {
    cout << hour << ":" << minute << ":" << second << endl;
  }
};

int main()
{
  Time time;
  time.setTime(12,30,50);
  time.display();
  time.setTime(35);
  time.display();
  time.setTime(42,31);
  time.display();
  system("pause");
}