vector向量back()函数运用实例

back函数

语法:

1 2	reference back(); const_reference back() const;

back() 返回最末一个元素

源代码

/**

* Returns a read/write reference to the data at the last

* element of the %vector.

reference

back() { return *(end() - 1); }

/**

* Returns a read-only (constant) reference to the data at the

* last element of the %vector.

const_reference

back() const { return *(end() - 1); }

测试代码

// 梁笔记

// https://zouzhongliang.com

#include <iostream>

#include <vector>

using namespace std;

int main()

{

vector<int> v1(5, 0);

vector<int> v2(10, 2);

v1.push_back(100);

cout<<"v1最末元素是："<< v1.back()<<endl;

for(int i=0;i<v1.size();++i){

cout<<v1[i]<<endl;

}

测试结果：

v1最末元素是：100

100