stl vector 函數

C ++ vector :: clear()函數 (C++ vector::clear() function)

vector::clear() is a library function of "vector" header, it is used to remove/clear all elements of the vector, it makes the 0 sized vector after removing all elements.

vector :: clear()是“ vector”頭文件的庫函數，用于刪除/清除向量中的所有元素，刪除所有元素后將其大小設為0。

Note: To use vector, include <vector> header.

注意：要使用向量，請包含<vector>標頭。

Syntax of vector::clear() function

vector :: clear()函數的語法

vector::clear();

Parameter(s): none – It accepts nothing.

參數： 無 –不接受任何內容。

Return value: void – It returns nothing.

返回值： void –不返回任何內容。

Example:

例：

Input:vector<int> v1{ 10, 20, 30, 40, 50 };//clearing content of the vectorsv1.clear();cout <> v1.size();Output:0

C ++程序演示vector :: clear()函數的示例 (C++ program to demonstrate example of vector::clear() function)

//C++ STL program to demonstrate example of //vector::clear() function#include <iostream> #include <vector> using namespace std;int main() {//vector declarationvector<int> v1{ 10, 20, 30, 40, 50 };//printing elementscout << "before clearing the elements..." << endl;cout << "size of v1: " << v1.size() << endl;cout << "v1: ";for (int x : v1)cout << x << " ";cout << endl;//clearing all elementsv1.clear();//printing elementscout << "after clearing the elements..." << endl;cout << "size of v1: " << v1.size() << endl;cout << "v1: ";for (int x : v1)cout << x << " ";cout << endl;return 0; }

Output

輸出量

before clearing the elements... size of v1: 5 v1: 10 20 30 40 50 after clearing the elements... size of v1: 0 v1:

Reference: C++ vector::clear()

參考： C ++ vector :: clear()

翻譯自: https://www.includehelp.com/stl/vector-clear-function-with-example.aspx

stl vector 函數

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