stl向量

Given an array and we have to copy its elements to a vector in C++ STL.

给定一个数组，我们必须将其元素复制到C ++ STL中的向量。

将数组元素复制到向量 (Copying array elements to a vector)

In C++ STL, we can copy array elements to a vector by using the following ways,

在C ++ STL中，我们可以使用以下方式将数组元素复制到向量中 ：

1. Assigning array elements while declaring a vector

   在声明向量的同时分配数组元素

   When we declare a vector we can assign array elements by specifying the range [start, end] of an array.

   声明向量时，可以通过指定数组的范围[开始，结束]来分配数组元素。

       vector<type> vector_name(array_start, array_end);
   
   

2. By using copy function

   通过使用复制功能

   copy() function is a library function of algorithm header it can be used to copy an array’s elements to a vector by specifying the array range [start, end] and an iterator pointing to the initial position (from where we want to assign the content) of the vector.

   copy()函数是算法标头的库函数，可通过指定数组范围[start，end]和指向初始位置的迭代器(用于从中分配内容)将其复制到向量中向量)。

       vector<type> vector_name(size);
   std::copy(array_start, array_end, vector_start_iterator);
   
   

Note: To use vector – include <vector> header, and to use copy() function – include <algorithm> header or we can simply use <bits/stdc++.h> header file.

注意：要使用vector –包含<vector>头文件，而要使用copy()函数 –包含<algorithm>头文件，或者我们可以简单地使用<bits / stdc ++。h>头文件。

C ++ STL程序将数组元素复制到向量 (C++ STL program to copy array elements to a vector )

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main()
{//an array
int arr[] = { 10, 20, 30, 40, 50 };
//assigning array to vector while declaring it
vector<int> v1(arr + 0, arr + 5);
//declaring an arrray first
//and then copy the array content
vector<int> v2(5);
copy(arr + 0, arr + 5, v2.begin());
//printing the vectors
cout << "vector (v1): ";
for (int x : v1)
cout << x << " ";
cout << endl;
cout << "vector (v2): ";
for (int x : v2)
cout << x << " ";
cout << endl;
return 0;
}

Output

输出量

vector (v1): 10 20 30 40 50
vector (v2): 10 20 30 40 50

翻译自: https://www.includehelp.com/stl/how-to-copy-array-elements-to-a-vector.aspx

stl向量