C++ Array Exercises And Solutions Pdf

9 min read Jul 05, 2024

C++ Array Exercises and Solutions: A Comprehensive Guide

This article will provide you with a comprehensive list of C++ array exercises and solutions to help you master the concept of arrays in C++. Arrays are fundamental data structures in programming, and a strong understanding of them is crucial for any aspiring C++ developer.

What are Arrays?

In C++, an array is a collection of elements of the same data type stored in contiguous memory locations. You can access individual elements using an index, starting from 0 for the first element.

Why are Arrays Important?

Efficient Storage: Arrays provide a compact way to store multiple data items of the same type.
Easy Access: Elements in an array can be accessed directly using their index, making operations like searching and sorting efficient.
Foundation for Other Data Structures: Arrays are the building blocks for more complex data structures like lists, stacks, and queues.

Exercises and Solutions:

Basic Array Operations:

Create an array and initialize it:
- Exercise: Declare an array of integers called "numbers" with a size of 5 and initialize it with the values 10, 20, 30, 40, 50.
- Solution:
```
#include 
using namespace std;

int main() {
    int numbers[5] = {10, 20, 30, 40, 50};
    return 0;
}
```

Access array elements:

Exercise: Write a program to print the elements of an array.

Solution:

#include 
using namespace std;

int main() {
    int numbers[5] = {10, 20, 30, 40, 50};
    for (int i = 0; i < 5; i++) {
        cout << "Element " << i << ": " << numbers[i] << endl;
    }
    return 0;
}

Modify array elements:

Exercise: Write a program to change the value of the third element in the "numbers" array to 70.

Solution:

#include 
using namespace std;

int main() {
    int numbers[5] = {10, 20, 30, 40, 50};
    numbers[2] = 70; // Modify the third element
    return 0;
}

Array Manipulation:

Find the largest element:

Exercise: Write a program to find the largest element in an array.

Solution:

#include 
using namespace std;

int main() {
    int numbers[5] = {10, 20, 30, 40, 50};
    int largest = numbers[0]; // Assume first element is the largest
    for (int i = 1; i < 5; i++) {
        if (numbers[i] > largest) {
            largest = numbers[i];
        }
    }
    cout << "The largest element is: " << largest << endl;
    return 0;
}

Reverse an array:

Exercise: Write a program to reverse the elements of an array.

Solution:

#include 
using namespace std;

int main() {
    int numbers[5] = {10, 20, 30, 40, 50};
    int temp;
    for (int i = 0; i < 5/2; i++) {
        temp = numbers[i];
        numbers[i] = numbers[5 - i - 1];
        numbers[5 - i - 1] = temp;
    }
    return 0;
}

Sort an array:

Exercise: Implement a bubble sort algorithm to sort an array in ascending order.

Solution:

#include 
using namespace std;

int main() {
    int numbers[5] = {10, 20, 30, 40, 50};
    int n = 5;
    for (int i = 0; i < n - 1; i++) {
        for (int j = 0; j < n - i - 1; j++) {
            if (numbers[j] > numbers[j + 1]) {
                int temp = numbers[j];
                numbers[j] = numbers[j + 1];
                numbers[j + 1] = temp;
            }
        }
    }
    return 0;
}

Multidimensional Arrays:

Declare and initialize a 2D array:
- Exercise: Declare a 2x3 two-dimensional array called "matrix" and initialize it with values.
- Solution:
```
#include 
using namespace std;

int main() {
    int matrix[2][3] = {{1, 2, 3}, {4, 5, 6}};
    return 0;
}
```

Access elements in a 2D array:

Exercise: Write a program to print the elements of a 2D array.

Solution:

#include 
using namespace std;

int main() {
    int matrix[2][3] = {{1, 2, 3}, {4, 5, 6}};
    for (int i = 0; i < 2; i++) {
        for (int j = 0; j < 3; j++) {
            cout << matrix[i][j] << " ";
        }
        cout << endl;
    }
    return 0;
}

Advanced Arrays:

Dynamic Memory Allocation for Arrays:

Exercise: Write a program to create an array of integers using dynamic memory allocation and take the size of the array from the user.

Solution:

#include 
using namespace std;

int main() {
    int size;
    cout << "Enter the size of the array: ";
    cin >> size;

    int *numbers = new int[size]; // Dynamic allocation

    cout << "Enter the elements of the array: " << endl;
    for (int i = 0; i < size; i++) {
        cin >> numbers[i];
    }

    cout << "The elements of the array are: " << endl;
    for (int i = 0; i < size; i++) {
        cout << numbers[i] << " ";
    }
    cout << endl;

    delete[] numbers; // Deallocate the memory
    return 0;
}

Passing arrays to functions:

Exercise: Write a function to calculate the sum of all elements in an array.

Solution:

#include 
using namespace std;

int sumArray(int arr[], int size) {
    int sum = 0;
    for (int i = 0; i < size; i++) {
        sum += arr[i];
    }
    return sum;
}

int main() {
    int numbers[5] = {10, 20, 30, 40, 50};
    int sum = sumArray(numbers, 5);
    cout << "The sum of the array elements is: " << sum << endl;
    return 0;
}

Resources for Further Practice:

Websites:
- W3Schools: https://www.w3schools.com/cpp/cpp_arrays.asp
- GeeksforGeeks: https://www.geeksforgeeks.org/arrays-in-c-cpp/
Books:
- C++ Primer Plus: A comprehensive resource for C++ programming.
- Programming Principles and Practice Using C++: A great book for beginners.

Remember: Practice is key! Work through these exercises, experiment with different scenarios, and you'll become more comfortable and confident in using arrays in your C++ programs.

C++ Array Exercises And Solutions Pdf

C++ Array Exercises and Solutions: A Comprehensive Guide

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