ProgramGuruTo get the length of a vector in C++, you can use the size method of the std::vector class from the Standard Template Library (STL).
In this example,
std::vector class and the num_vector that holds integers using the std::vector declaration.num_vector with a set of numeric values using an initializer list {10, 20, 30, 40, 50}.size method on num_vector to get the number of elements in the vector. The size method returns the length of the vector as a size_t value.size method to a variable named num_vector_length.std::cout to display the value of num_vector_length on the console.#include <vector>
#include <iostream>
int main() {
std::vector<int> num_vector = {10, 20, 30, 40, 50};
std::size_t num_vector_length = num_vector.size();
std::cout << "Length of numeric vector: " << num_vector_length << std::endl;
return 0;
}Length of numeric vector: 5
In this example,
std::vector class and the str_vector that holds strings using the std::vector declaration.str_vector with a set of string values using an initializer list {"apple", "banana", "cherry"}.size method on str_vector to get the number of elements in the vector. The size method returns the length of the vector as a size_t value.size method to a variable named str_vector_length.std::cout to display the value of str_vector_length on the console.#include <vector>
#include <iostream>
int main() {
std::vector<std::string> str_vector = {"apple", "banana", "cherry"};
std::size_t str_vector_length = str_vector.size();
std::cout << "Length of string vector: " << str_vector_length << std::endl;
return 0;
}Length of string vector: 3
In this tutorial, we learned How to Get Length of a Vector in C++ language with well detailed examples.