C++ program to return an array from a function using a structure

C++ program to return an array from a function using a structure:

In this post, we will learn how to return an array from a function by using a structure. If you want to return an array from a function in C++, you can use a pointer or you can define a structure that includes an array.

Let’s try it with different examples.

C++ program to return an array using a structure:

Let’s take a look at the below example:

#include <iostream>
using namespace std;

struct arrayholder
{
    int odd[10];
};

arrayholder getArray()
{
    arrayholder a;

    for (int i = 0; i < 10; i++)
    {
        if (i % 2 != 0)
        {
            a.odd[i] = i;
        }
        else
        {
            a.odd[i] = -1;
        }
    }

    return a;
}

int main()
{
    arrayholder arr = getArray();

    for (int i = 0; i < 10; i++)
    {
        cout << arr.odd[i] << ' ';
    }
    cout << endl;
    return 0;
}

Here,

arrayholder is a structure with an array of 10 elements, odd.
getArray method returns one arrayholder.
Inside getArray, we are creating one arrayholder variable a and running one for loop. This loop runs from 0 to 10 and adds all odd values to the odd positions. For the even positions, it adds -1.

It will print the below output:

-1 1 -1 3 -1 5 -1 7 -1 9

Returning multiple arrays:

The advantage of this method is that we can return more than 1 arrays using a structure. For example:

#include <iostream>
using namespace std;

struct arrayholder
{
    int odd[10];
    int even[10];
};

arrayholder getArray()
{
    arrayholder a;

    for (int i = 0; i < 10; i++)
    {
        if (i % 2 != 0)
        {
            a.odd[i] = i;
            a.even[i] = -1;
        }
        else
        {
            a.odd[i] = -1;
            a.even[i] = i;
        }
    }

    return a;
}

int main()
{
    arrayholder arr = getArray();

    for (int i = 0; i < 10; i++)
    {
        cout << arr.odd[i] << ' ';
    }
    cout << endl;

    for (int i = 0; i < 10; i++)
    {
        cout << arr.even[i] << ' ';
    }
    cout << endl;
    return 0;
}

The structure holds two arrays: odd and even. If you run this program, it will print the below output:

-1 1 -1 3 -1 5 -1 7 -1 9 
0 -1 2 -1 4 -1 6 -1 8 -1

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