Array Practice Problems in C++

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Array Practice Problems in C++:

In this article, I am going to discuss Array Practice Problems in C++ with examples. Please read our previous articles, where we Multidimensional Array in C++ Language with examples.

Program to calculate the average of all the elements in an array using C++:

#include <iostream>
using namespace std;
int main()
{
    int n, m, sum = 0;
    cout << "Enter size of array: ";
    cin >> n;
    int *A = new int[n];
    cout << "\nEnter Elements of Array:\n";
    for (int i = 0; i < n; i++)
    {
        cin >> A[i];
        sum += A[i];
    }
    cout << "\nAverage: " << (float) sum / n;
}

Output:

Program to Multiply 2 Matrices using C++:

#include <iostream>
using namespace std;
int main()
{
    int a[10][10], b[10][10], mult[10][10], r1, c1, r2, c2, i, j, k;
    cout << "Enter rows and columns for first matrix: ";
    cin >> r1 >> c1;
    cout << "Enter rows and columns for second matrix: ";
    cin >> r2 >> c2;

    if (c1 != r2)
    {
        cout << "Cant be Multiplied";
        return 0;
    }

    // Storing elements of first matrix.
    cout << endl << "Enter elements of matrix 1:" << endl;
    for (i = 0; i < r1; ++i)
        for (j = 0; j < c1; ++j)
        {
            cout << "Enter element a" << i + 1 << j + 1 << " : ";
            cin >> a[i][j];
        }

    // Storing elements of second matrix.
    cout << endl << "Enter elements of matrix 2:" << endl;
    for (i = 0; i < r2; ++i)
        for (j = 0; j < c2; ++j)
        {
            cout << "Enter element b" << i + 1 << j + 1 << " : ";
            cin >> b[i][j];
        }

    // Multiplying matrix a and b and storing in array mult.
    for (i = 0; i < r1; ++i)
        for (j = 0; j < c2; ++j)
        {
           mult[i][j] = 0;
           for (k = 0; k < c1; ++k)
           {
               mult[i][j] += a[i][k] * b[k][j];
           }
        }

    // Displaying the multiplication of two matrix.
    cout << endl << "Output Matrix: " << endl;
    for (i = 0; i < r1; ++i)
        for (j = 0; j < c2; ++j)
        {
            cout << " " << mult[i][j];
            if (j == c2 - 1)
            cout << endl;
        }

    return 0;
}

Output:

In the next article, I am going to discuss Pointers in C++ with examples. Here, in this article, I try to explain Array Practice Problems in C++ with examples. I hope you enjoy this Array Practice Problem in C++ with examples article. I would like to have your feedback. Please post your feedback, question, or comments about this article.