lambda - print-out array and add comment

Sure! Here is an example of how you can use a lambda function in C++ to print out an array and add a comment for each element:

#include <iostream>
#include <array>
#include <algorithm>

int main() {
    std::array<int, 5> arr = {1, 2, 3, 4, 5};

    // Using a lambda function to print out the array and add a comment for each element
    std::for_each(arr.begin(), arr.end(), [](int elem) {
        std::cout << "Element: " << elem << " - Comment: This is element " << elem << std::endl;
    });

    return 0;
}

Explanation:

• We include the necessary header files, iostream, array, and algorithm, to use the necessary functions and data types.
• We define the main function as the entry point of the program.
• We create an std::array named arr of type int with a size of 5 and initialize it with the values 1, 2, 3, 4, and 5.
• We use the std::for_each algorithm function to iterate over each element in the array.
• Within the lambda function, we define the parameter elem to represent each element in the array.
• Inside the lambda function, we use std::cout to print out the element and add a comment for each element using the << operator.
• Finally, we return 0 to indicate successful execution of the program.

This program will output:

Element: 1 - Comment: This is element 1
Element: 2 - Comment: This is element 2
Element: 3 - Comment: This is element 3
Element: 4 - Comment: This is element 4
Element: 5 - Comment: This is element 5

I hope this helps! Let me know if you have any further questions.