vector clear() in C++

clear(): It is a build-in function in the STL library of C++. This function erases all the elements from the vector. If elements are pointers then the pointer- to memory is not touched in any way.

Synatx:

vecName.clear()

File: stl_vector.h

For Example:

vec = {1,2,3,4,5}

vec.clear() => vec={}

So size of vector is 0.

Approach

C++

#include <bits/stdc++.h>
using namespace std;

int main()
{
    vector<int> vec = {1, 2, 3, 4, 5};

    vec.clear();

    cout << vec.size() << "\n";

    return 0;
}