C++ Vector capacity

This function calculates the present size of the vector.

Note: Capacity of the vector can be equal or greater than the size of the vector and if it is greater than the size of the vector, means allowing extra space to accommodate further operations.

Syntax

Consider a vector denoted as 'v' and a capacity denoted as 'c'. The syntax is as follows:

int c=v.capacity();

Parameter

It does not contain any parameter.

Return value

It provides the present allocated capacity of the vector.

Example 1

Let's see a simple example.

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

Output:

Capacity of the vector is :5

In this illustration, vector v holds integer values, and the capacity method determines the capacity of the vector v.

Example 2

Let's see a another simple example.

#include<iostream>
#include<vector>
using namespace std;
int main()
{
	vector<char>ch{'j','a','v','a'};
	int c=ch.capacity();
	cout<<"Capacity of the vector is :"<<c;
	return 0;
}

Output:

Capacity of the vector is :5

In this instance, the vector ch holds character values, and the capacity method is responsible for indicating the capacity of the vector ch.