String * arr填充数据，我发送了一个公共变量而不是数组。 [英] String * arr filling with data, I sent a common variable instead of an array.

问题描述

<pre>//Main function

void printBythePrice(const HousingRegister &house){

	float max;
	string *arr = new string[house.getnrOfHouses()];
	cout << "Enter the price";
	cin >> max;

	house.printBythePrice(arr, max);

	for (int i = 0; i < house.getnrOfHouses(); i++)

	{
		cout << arr[i];
	}
	delete[] arr;
}



//handler Functinen
void HousingRegister::printBythePrice(string *arr, float max)const {

	int index = 0;

	for (int i = 0; i <nrOfHouses; i++)

	{
		if (housing[i]->getRent() >= max)

		{
                arr[index] = housing[i]->toString();

			index++;
		}
	}

}

什么我试过了：



我有修理这个打印代码的问题，但我对阵列有问题。

函数需要一个字符串* arr填充数据，但你提交的是一个公共变量而不是一个数组。



如何修复它？

What I have tried:

I have trie to fix this print code but, i have a problem with the array.
function expects a string * arr filling with data, but you submit a common variable instead of an Array.

How can i fix it?

推荐答案

CPallini似乎是对的：你的字符串指针本身并不是一个数组。可能它只是一个字符串，您可以将其字符作为子字符串访问。关于数组的一些阅读。



分配一个在你的代码中使用的字符串数组：

CPallini seems to be right: your string pointer isnt an array per se. May it is only a string and you access its chars as substring. Some reading about arrays.

Allocate an string array for the use in your code like that:

string array[COUNT];

提示：使用调试器并输出一些内容以查看

Tip: use a debugger and make some output to see what

你的代码应该可以工作。

至少，它适用于我为了让它运行而创建的虚假场景

Your code should work.
And, at least, it works in the fake scenario I created to make it run

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

class Housing
{
  float rent;
  string name;
public:
  Housing(string name, float rent):rent(rent), name(name){}
  int getRent(){return rent;}
  string toString(){return name;}
};

class HousingRegister
{
  int nrOfHouses;
  vector<Housing * > housing;

public:
  HousingRegister(int houses):nrOfHouses(houses)
  {
    for ( int n=0; n<houses; ++n)
    {
      string name = "foo";
      name.append( 1, (char)('0' + n));
      float rent = 1000.0f * (n+1);
      housing.push_back( new Housing( name, rent ));
    }
  }
  ~ HousingRegister()
  {
    for (size_t n=0; n<housing.size(); ++n)
      delete housing[n];
  }

  void printBythePrice(string *arr, float max) const;
  int getnrOfHouses() const { return nrOfHouses; };

};
void printBythePrice(const HousingRegister &house){

  float max;
  string *arr = new string[house.getnrOfHouses()];
  cout << "Enter the price";
  cin >> max;

  house.printBythePrice(arr, max);

  for (int i = 0; i < house.getnrOfHouses(); i++)

  {
    cout << arr[i];
  }
  delete[] arr;
}



//handler Functinen
void HousingRegister::printBythePrice(string *arr, float max)const {

  int index = 0;

  for (int i = 0; i <nrOfHouses; i++)

  {
    if (housing[i]->getRent() >= max)

    {
                arr[index] = housing[i]->toString();

      index++;
    }
  }
}

int main()
{
  HousingRegister hr(5);

  printBythePrice(hr);
}

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