vector size() in C++

size(): It returns the number of elements in the vector. 

File: stl_vector.h

Parameter: No parameters are required for this function.

Syntax:

vecName.size()

For Example:

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

vec.size() = > It returns size of vector (i.e 5)

Approach

C++

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

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

    cout << vec.size() << "\n";

    return 0;
}