C++ Vector size() function

C++ Vector size() function tutorial for beginners and professionals with examples on assign(), at(), back(), begin(), capacity(), cbegin(), cend(), clear(), crbegin(), crend(), data(), emplace(), end(), front(), rbegin(), resize(), size(), swap() etc.

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C++ Vector size()

It determines the number of elements in the vector.

Syntax

Consider a vector 'v' and number of elements 'n'. Syntax would be :

int n=v.size();

Parameter

It does not contain any parameter.

Return value

It returns the number of elements in the vector.

Example 1

Let's see a simple example.

#include<iostream>
#include<vector>
using namespace std;
int main()
{
	vector<string> v{"Welcome to javaTpoint","c"};
	int n=v.size();
	cout<<"Size of the string is :"<<n;
	return 0;
}

Output:

Size of the string is:2

In this example, vector v containing two strings and size() function gives the number of elements in the vector.

Example 2

Let's see a another simple example.

#include<iostream>
#include<vector>
using namespace std;
int main()
{
	vector<int> v{1,2,3,4,5};
	int n=v.size();
	cout<<"Size of the vector is :"<<n;
	return 0;
}

Output:

Size of the vector is :5

In this example, vector v containing integer values and size() function determines the number of elements in the vector.

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