如何將數組的值獲取到向量然后返回到另一個數組？

Question

堆棧中的動態數組？ 所以從這個鏈接，我看到了這個：

#include <iostream>
#include <vector>

int main()
{
    int x = 0;
    std::cin >> x;

    std::vector<char> pz(x);
}

但我想要的是這樣的：

include <iostream>
include <vector>

using namespace std;

int main()
{
     long int *p;
     long int *another_p;
     p = generate_random_vector(); //this is a function that generates a vector
                                   //and I'm assigning this vector to *p

     vector<long int>vectorName(n); //size n will be known when I read from a file
                                    //I would like to store the value of vector of *p in vectorName

     *another_p = vectorName; //I would like to store the value of vectorName in *another_p

     return 0;
}

那么有什么建議嗎？

這是我最初做的，在 C++ 中是不允許的：

int main()
{
     long int *p;
     long int *another_p;
     long int arrayName[n]; //n can be obtained from reading a file

     p = generate_random_vector(); 

     for ( int i = 0; i < n; i++ )
     {
          arrayName[i] = p[i];
     }

     for ( int i = 0; i < n; i++ )
     {
          another_p[i] = arrayName[i];
     }
     return 0;
}

Answer 1

如果您修改generate_random_vector以返回std::vector<long int> ，並將another_p和arrayName定義為std::vector<long int> （默認構造，無需指定大小），那么您可以簡單地使用賦值，如我在評論中說：

std::vector<long> generate_random_vector();

int main()
{
     std::vector<long> p;
     std::vector<long> another_p;
     std::vector<long> arrayName;

     p = generate_random_vector(); 

     arrayName = p;
     another_p = arrayName;
}