c ++向量庫

The ways that we are using to copy vectors in C++, are:

我們用于在C ++中復制向量的方法是：

Copy one vector's elements to another (Simple approach)

將一個向量的元素復制到另一個(簡單方法)

Copy vector by using an assignment operator

通過使用賦值運算符復制向量

Copy vector 1 to vector 2 while declaring vector 2 by passing the first vector as an argument (parameterized constructor)

通過將第一個向量作為參數傳遞來聲明向量2的同時將向量1復制到向量2(帶參數的構造函數)

1)將一個向量的元素復制到另一個(簡單方法) (1) Copy one vector’s elements to another (Simple approach))

#include <iostream> #include <vector> using namespace std;int main() {//declar and initialize vector 1vector<int> v1{10,20,30,40,50};//declare vector2vector<int> v2;//copy v2 to v1for(int i=0; i<v1.size(); i++){v2.push_back(v1[i]);}//printing v1 and v2cout<<"v1 elements: ";for(int i=0; i<v1.size(); i++){cout<<v1[i]<<" ";}cout<<endl;cout<<"v2 elements: ";for(int i=0; i<v2.size(); i++){cout<<v2[i]<<" ";}cout<<endl; return 0; }

Output

輸出量

v1 elements: 10 20 30 40 50 v2 elements: 10 20 30 40 50 .minHeight{min-height: 250px;}@media (min-width: 1025px){.minHeight{min-height: 90px;}} .minHeight{min-height: 250px;}@media (min-width: 1025px){.minHeight{min-height: 90px;}}

2)使用賦值運算符復制向量 (2) Copy vector by using an assignment operator)

Syntax:

句法：

v2 = v1; #include <iostream> #include <vector> using namespace std;int main() {//declar and initialize vector 1vector<int> v1{10,20,30,40,50};//declare vector2vector<int> v2;//copying v1 to v2v2 = v1;//printing v1 and v2cout<<"v1 elements: ";for(int i=0; i<v1.size(); i++){cout<<v1[i]<<" ";}cout<<endl;cout<<"v2 elements: ";for(int i=0; i<v2.size(); i++){cout<<v2[i]<<" ";}cout<<endl; return 0; }

Output

輸出量

v1 elements: 10 20 30 40 50 v2 elements: 10 20 30 40 50

3)將向量1復制到向量2，同時通過將第一個向量作為參數傳遞來聲明向量2(參數化構造函數) (3) Copy vector 1 to vector 2 while declaring vector 2 by passing the first vector as an argument (parameterized constructor))

Syntax:

句法：

vector<int> v2(v1); #include <iostream> #include <vector> using namespace std;int main() {//declar and initialize vector 1vector<int> v1{10,20,30,40,50};//declare vector2 by copying vector1vector<int> v2(v1);//printing v1 and v2cout<<"v1 elements: ";for(int i=0; i<v1.size(); i++){cout<<v1[i]<<" ";}cout<<endl;cout<<"v2 elements: ";for(int i=0; i<v2.size(); i++){cout<<v2[i]<<" ";}cout<<endl; return 0; }

Output

輸出量

v1 elements: 10 20 30 40 50 v2 elements: 10 20 30 40 50

翻譯自: https://www.includehelp.com/stl/copy-a-vector-to-another.aspx

c ++向量庫

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