C++ Array Functions 🎯

Welcome to our comprehensive guide on C++ Array Functions! In this lesson, we'll learn about arrays, their types, and various functions to manipulate them. Let's dive in!

Understanding Arrays 📝

An array is a collection of variables of the same data type stored in contiguous memory locations. In C++, arrays can be of various types like integer arrays, character arrays, and floating-point arrays.

cpp

int arr[5] = {1, 2, 3, 4, 5};  // Integer Array
char arrCh[3] = {'H', 'e', 'l'};  // Character Array
float arrF[2] = {1.2, 3.4};  // Floating-Point Array

💡 Pro Tip: The size of the array is determined at compile time.

Array Functions 📝

C++ provides several built-in functions to manipulate arrays. Here are some of the most commonly used ones:

1. `sizeof()` 📝

The sizeof() function returns the size of the array in bytes.

cpp

int arr[5] = {1, 2, 3, 4, 5};
std::cout << "Size of the array: " << sizeof(arr) << "\n";

2. `arr[index]` 📝

Accessing an array using an index retrieves the value at that index.

cpp

int arr[5] = {1, 2, 3, 4, 5};
std::cout << "First element: " << arr[0] << "\n";

3. `arr_name[start..end]` 📝

Accessing an array using a range retrieves values within that range.

cpp

int arr[5] = {1, 2, 3, 4, 5};
std::cout << "Elements from 2 to 4: ";
for(int i = 1; i < 4; i++) {
    std::cout << arr[i] << " ";
}
std::cout << "\n";

4. `array_name.length()` 📝

The length() function is not a built-in function in C++, but you can write a simple function to get the array length:

cpp

int arr[5] = {1, 2, 3, 4, 5};
int length = sizeof(arr) / sizeof(arr[0]);
std::cout << "Array length: " << length << "\n";

Practical Example 💡

Let's create a program that takes user input for an array, finds the maximum and minimum values, and displays the sum of even numbers.

cpp

#include<iostream>
using namespace std;

void findMaxMinAndSumEven(int arr[], int size) {
    int max = arr[0];
    int min = arr[0];
    int sumEven = 0;

    for(int i = 0; i < size; i++) {
        if(arr[i] % 2 == 0) {
            sumEven += arr[i];
        }

        if(arr[i] > max) {
            max = arr[i];
        }
        if(arr[i] < min) {
            min = arr[i];
        }
    }

    cout << "Maximum: " << max << "\n";
    cout << "Minimum: " << min << "\n";
    cout << "Sum of even numbers: " << sumEven << "\n";
}

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

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

    findMaxMinAndSumEven(arr, size);
    return 0;
}

C++ Array Functions 🎯

C++ Array Functions 🎯

Understanding Arrays 📝

Array Functions 📝

1. sizeof() 📝

2. arr[index] 📝

3. arr_name[start..end] 📝

4. array_name.length() 📝

Practical Example 💡

Quiz 💡

1. `sizeof()` 📝

2. `arr[index]` 📝

3. `arr_name[start..end]` 📝

4. `array_name.length()` 📝