C++ Programming Code Examples
Learn C++ Language
Vector Library size() Function in C++ Programming Language
Vector Library size() Function in C++
Return size. Returns the number of elements in the vector. This is the number of actual objects held in the vector, which is not necessarily equal to its storage capacity. vector::size() is a library function of "vector" header, it is used to get the size of a vector, it returns the total number of elements in the vector.
The dynamic array can be created by using a vector in C++. One or more elements can be inserted into or removed from the vector at the run time that increases or decreases the size of the vector. The size or length of the vector can be counted using any loop or the built-in function named size().
Syntax for Vector size() Function in C++
#include <vector>
size_type size() const noexcept;
Complexity
Constant
Iterator validity
No changes
Data races
The container is accessed. No contained elements are accessed: concurrently accessing or modifying them is safe.
Exception safety
No-throw guarantee: this member function never throws exceptions.
/* get the size of a vector, it returns the total number of elements in the vector by vector::size() library function. */
#include <bits/stdc++.h>
using namespace std;
int main()
{
// Initializing a vector of string type
vector<string> vec = { "Happy", "8)", "Codings" };
// Clearing the vector
// Now size is equal to 0
vec.clear();
// Typecasting vec.size() to int
for (int i = 0; i < (int)vec.size() - 1; i++)
cout << vec[i] << ' ';
cout << "Happy8)Codings";
return 0;
}
Internal method to insert into a subtree. x is the item to insert. t is the node that roots the tree. Set the "New Root". Internal method to remove from subtree. x: the item to remove.
We can use "break" statement inside loops to terminate a 'loop & exit' it. In above example loop execution 'continues' until either n>=20 or entered score is negative. This statement
This is a C++ Program to implement nearest neighbour algorithm to 'solve TSP'. This C++ program implements the travelling salesman problem which computes the minimum cost
