STL Arrays in C++

Standard Template Library

inserting an Image

How do we create an STL Array?

#include <iostream>
#include <array>

using namespace std;


int main()
{
    array <int, 20 > data = {1,2,3};

    cout << data[0] << endl;
    cout << data[1] << endl;
    cout << data[2] << endl;
    cout << data[8] << endl;
}

Output

Lets make a print_array function with a loop to print our STL Array

#include <iostream>
#include <array>

using namespace std;


void print_array( array<int,20> data)
{
    for ( int i= 0; i < data.size(); i++)
    {
        cout << data[i] << "\t";

    }
    cout << "\n";
}

int main()
{
    array <int, 20 > data = {1,2,3};

    print_array(data);
}

Output

1       2       3       0       0       0       0       0       0       0       0       0       0       0       0       0       0       0       0       0

Can we just print (1,2, 3) ?

yes, we can pass in the size as a seperate argument

#include <iostream>
#include <array>

using namespace std;


void print_array( array<int,20> data, int size)
{
    for ( int i= 0; i < size; i++)
    {
        cout << data[i] << "\t";

    }
    cout << "\n";
}

int main()
{
    array <int, 20 > data = {1,2,3};


    print_array(data, 3);
}

Output

1       2       3