#include<iostream>#include<stdint.h>#include<vector>using namespace std;intmain(){std::vector<uint8_t>temp0(0,0);cout<<"vector size:"<<temp0.size()<<endl;std::vector<uint8_t>temp1();//cout << "vector size:" <<
C++ std::vector使用简介 使用vector,需添加头文件#include<vector>, 要使用sort或find,则需要添加头文件#include<algorithm>。 为了简化书写,需在.h中增加using namespace std; 1.vector的初始化及赋值 1std::vector<int> nVec;//空对象2std::vector<int> nVec(5,-1);//创建了一个包含5个元素且值为-1...
std::vector中不存在直接查找某个元素是否存在的方法,一般是通过<algorithm>中的std::find, std::find_if, std::count, std::count_if等方法的返回值来判断对应元素是否存在。 如当vector中存储的元素为 double 类型时,需要设定其精度,判断代码如下 #include<vector>#include<algorithm>doubletargetVal=0.01;vecto...
- 例如，使用迭代器遍历`std::vector`：#include <iostream> #include <vector> int main() { std::vector<int> myVector = {1, 2, 3, 4, 5};std::vector<int>::iterator it;for (it = myVector.begin(); it!= myVector.end(); ++it) { std::cout << *it << " ";} return 0;} `...
#include <vector>struct Foo{ Foo(int v):val(v){} int val;}; int main(int argc, char const *argv[]){ std::vector<Foo> vf; vf.push_back(42); std::cout << vf.back().val << std::endl; //42} 我以为最新的编译器中push_back已经支持传入参数构造出对象了,起始是隐士转换的锅!在...
#include <stdio.h> #include <unistd.h> #include <iostream> #include <vector> class MyClass { public: MyClass(int value) :ptr_(new int(value)) { std::cout << "Default constructor called: MyClass(int value)" << std::endl; } MyClass(const MyClass& other) // 拷贝构造函数 : ptr...
#include<iostream>#include<vector>#include<algorithm>intmain(){std::vector<int>vec={1,2,3,4,5};inttarget=3;autoit=std::find(vec.begin(),vec.end(),target);if(it!=vec.end()){std::cout<<"Vector contains "<<target<<std::endl;}else{std::cout<<"Vector does not contain "<<...
#include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) { ui->setupUi(this); // 定义 std::vector<int> nNullVec;// 空对象 std::vector<int> nVec1(5, -1);// 包含10个元素,且值为-1 ...
obj.size() 1. 如 #include <string.h> #include <vector> #include <iostream> using namespace std; int main() { vector<int>obj;//创建一个向量存储容器 int for(int i=0;i<10;i++) // push_back(elem)在数组最后添加数据 { obj.push_back(i); ...
#include <iostream>#include <vector>intmain(){// Create a vector containing integersstd::vector<int>v={8,4,5,9};// Add two more integers to vectorv.push_back(6);v.push_back(9);// Overwrite element at position 2v[2]=-1;// Print out the vectorfor(intn:v)std::cout<<n<<'...