Arrays and vectors are important data structures in C++ that allow you to store and manipulate collections of elements. They are useful when you need to work with multiple values of the same type.
In C++, arrays are fixed-size containers that hold a specific number of elements. You can access and modify array elements using their indices, which start from 0.
Here's an example of declaring and accessing elements in an array:
1#include <iostream>
2using namespace std;
3
4int main() {
5 // Declare an array
6 int arr[5] = {1, 2, 3, 4, 5};
7
8 // Accessing array elements
9 cout << "First element: " << arr[0] << endl;
10 cout << "Third element: " << arr[2] << endl;
11
12 // Modify array elements
13 arr[1] = 10;
14 cout << "Modified second element: " << arr[1] << endl;
15
16 return 0;
17}Output:
1First element: 1
2Third element: 3
3Modified second element: 10Vectors, on the other hand, are dynamic arrays that can grow or shrink in size at runtime. They provide more flexibility compared to fixed-size arrays.
Here's an example of declaring and accessing elements in a vector:
1#include <iostream>
2#include <vector>
3
4using namespace std;
5
6int main() {
7 // Declare and initialize a vector
8 vector<int> vec = {1, 2, 3, 4, 5};
9
10 // Accessing vector elements
11 cout << "First element: " << vec[0] << endl;
12 cout << "Third element: " << vec[2] << endl;
13
14 // Modify vector elements
15 vec[1] = 10;
16 cout << "Modified second element: " << vec[1] << endl;
17
18 return 0;
19}Output:
1First element: 1
2Third element: 3
3Modified second element: 10Arrays and vectors are fundamental in C++ programming and are widely used to solve various programming problems.
xxxxxxxxxx}using namespace std;int main() { // Declare an array int arr[5] = {1, 2, 3, 4, 5}; // Accessing array elements cout << "First element: " << arr[0] << endl; cout << "Third element: " << arr[2] << endl; // Modify array elements arr[1] = 10; cout << "Modified second element: " << arr[1] << endl; // Declare and initialize a vector vector<int> vec = {1, 2, 3, 4, 5}; // Accessing vector elements cout << "First element: " << vec[0] << endl; cout << "Third element: " << vec[2] << endl; // Modify vector elements vec[1] = 10; cout << "Modified second element: " << vec[1] << endl; return 0;