Compare and contrast C++ and Rust

First, please write a program with very good comments to add two integers in C++, and then write the same program in Rust so that one can compare and contrast the 2 programming languages.

C++:

#include <iostream>  // Include the input/output stream library

int main() {
    // Declare variables to hold the two integers
    int num1, num2;

    // Prompt the user to enter the first integer
    std::cout << "Enter the first integer: ";
    std::cin >> num1;

    // Prompt the user to enter the second integer
    std::cout << "Enter the second integer: ";
    std::cin >> num2;

    // Calculate the sum of the two integers
    int sum = num1 + num2;

    // Display the result
    std::cout << "The sum of " << num1 << " and " << num2 << " is " << sum << std::endl;

    return 0;  // Indicate successful program execution
}

Rust:

use std::io;  // Import the standard I/O module

fn main() {
    // Declare variables to hold the two integers
    let mut num1 = String::new();
    let mut num2 = String::new();

    // Prompt the user to enter the first integer
    println!("Enter the first integer: ");
    io::stdin().read_line(&mut num1).expect("Failed to read line");

    // Convert the input to an integer
    let num1: i32 = num1.trim().parse().expect("Please enter a valid number");

    // Prompt the user to enter the second integer
    println!("Enter the second integer: ");
    io::stdin().read_line(&mut num2).expect("Failed to read line");

    // Convert the input to an integer
    let num2: i32 = num2.trim().parse().expect("Please enter a valid number");

    // Calculate the sum of the two integers
    let sum = num1 + num2;

    // Display the result
    println!("The sum of {} and {} is {}", num1, num2, sum);
}