c ++向量库_将向量复制到C ++中的另一个向量

朴灿烈づ我的快乐病毒、 2023-03-05 11:58 2阅读 0赞

c ++向量库

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

我们用于在C ++中复制向量的方法是：

1.  Copy one vector's elements to another (Simple approach)
    
    将一个向量的元素复制到另一个(简单方法)
2.  Copy vector by using an assignment operator
    
    通过使用赋值运算符复制向量
3.  Copy vector 1 to vector 2 while declaring vector 2 by passing the first vector as an argument (parameterized constructor)
    
    通过将第一个向量作为参数传递来声明向量2的同时将向量1复制到向量2(带参数的构造函数)

### 1)将一个向量的元素复制到另一个(简单方法) **(**1) Copy one vector’s elements to another (Simple approach)**)** ###

#include <iostream>
    #include <vector>
    using namespace std;
    
    int main()
    {
        
    
    	//declar and initialize vector 1
    	vector<int> v1{
        10,20,30,40,50};
    	//declare vector2
    	vector<int> v2;
    	
    	//copy v2 to v1
    	for(int i=0; i<v1.size(); i++){
        
    		v2.push_back(v1[i]);
    	}
    	
    	//printing v1 and v2
    	cout<<"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**

**输出量**

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

### 2)使用赋值运算符复制向量 **(**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 1
    	vector<int> v1{
        10,20,30,40,50};
    	//declare vector2
    	vector<int> v2;
    	
    	//copying v1 to v2
    	v2 = v1;
    	
    	//printing v1 and v2
    	cout<<"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**

**输出量**

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

### 3)将向量1复制到向量2，同时通过将第一个向量作为参数传递来声明向量2(参数化构造函数) **(**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 1
    	vector<int> v1{
        10,20,30,40,50};
    	//declare vector2 by copying vector1
    	vector<int> v2(v1);
    	
    	//printing v1 and v2
    	cout<<"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**

**输出量**

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

> 翻译自: [https://www.includehelp.com/stl/copy-a-vector-to-another.aspx][https_www.includehelp.com_stl_copy-a-vector-to-another.aspx]

c ++向量库

[https_www.includehelp.com_stl_copy-a-vector-to-another.aspx]: https://www.includehelp.com/stl/copy-a-vector-to-another.aspx