#include <iostream> #include <vector> int main() { std::vector<int> numbers = {1, 2, 3, 4, 5}; // 使用引用修改第一个元素 int& firstElement = numbers[0]; firstElement = 10; // 输出修改后的向量 for (const auto& num : numbers) { std::cout << num << " "; } return 0;...
for(int i=0;i<=10;i++){ value.push_back(i); }// 进行填充数据; c++及以上的支持该语法; vector<int >numbers={1,23,4,5,4,6}; 增大和减小向量; 如果我们还要其他的数据向量,可使用push_back()函数将元素添置末尾,从而其大小也在加一; std::vector<double>value;doubleintput;while(cin>>int...
std::vector<int> numbers; std::vector<int*> ptr_numbers; for (int i = 0; i < 8; i++) { numbers.push_back(i); ptr_numbers.push_back(&numbers.back()); } 我希望这会给我一个包含一些数字的向量和一个指向这些数字的指针向量。但是,当列出 ptr_numbers 指针的内容时,会有不同的看似随...
int main() { sf::RenderWindow window(sf::VideoMode(800, 600), "SFML Vector Example"); std::vector<int> numbers = {1, 2, 3, 4, 5}; // 访问数组元素 int firstElement = numbers[0]; int secondElement = numbers[1]; // 修改数组元素 numbers[2] = 10; // 遍历数组 for (int i ...
#include<iostream>#include<vector>#include<algorithm>intmain(){std::vector<int>numbers={1,2,3,4,5,6,7,8,9,10};// 要删除的对象std::vector<int>toRemove={2,4,6,8};// 使用erase-remove idiom删除多个对象numbers.erase(std::remove_if(numbers.begin(),numbers.end(),[&](intnum){r...
first = false, "" : ", ") << x; std::cout << "]\n"; } } int main() { std::vector<int> numbers{1, 2, 3}; stq::println("{}", numbers); while (not numbers.empty()) { numbers.pop_back(); stq::println("{}", numbers); } } 输出: [1, 2, 3] [1, 2] [1]...
int append(std::vector<int>& numbers, int number){ boost::mutex::scoped_lock slock( my_lock ); int retval = numbers.size(); numbers.push_back(number); return retval; }您需要以这种方式保护任何读/写操作。另一种方法是为 std::vector创建包装类，它将通过线程支持扩展它。查看此...
#include <iostream>#include <vector>intmain(){std::cout<<std::boolalpha;std::vector<int>numbers;std::cout<<"Initially, numbers.empty(): "<<numbers.empty()<<'\n';numbers.push_back(42);std::cout<<"After adding elements, numbers.empty(): "<<numbers.empty()<<'\n';} ...
// 构造 vectors#include<iostream>#include<vector>intmain(){// 按上述顺序使用的构造函数:std::vector<int>first;// 整数的空向量std::vector<int>second(4,100);// 值为100的四个整数std::vector<int>third(second.begin(),second.end());// 遍历构造std::vector<int>fourth(third);// 赋值构造/...
int main() { // Create a vector object that contains 10 elements. vector<int> v; for (int i = 1; i < 10; ++i) { v.push_back(i); } // Count the number of even numbers in the vector by // using the for_each function and a lambda. int evenCount = 0; for_each(v....