Algorithm

Initialize a variable called sum to store the sum of elements from index l to r.
Use a loop to iterate from index l to r.
In each iteration, add the current element (i) to the sum.
After completing the loop, print the sum variable, which will contain the total sum of elements from l to r.

Code

#include<bits/stdc++.h>
using namespace std;

int main()
{
    // Define the lower and upper bounds of the range
    int l = 2, r = 7;
    
    int sum = 0;  // Initialize the sum to 0
    
    // Loop through the range and calculate the sum
    for (int i = l; i <= r; i++) {
        sum += i;  // Add each number in the range to the sum
    }

    // Output the sum of numbers in the given range
    cout << "The sum of numbers in the given range is " << sum;

    return 0;
}
class Solution {

    // Function to calculate the sum of numbers in a given range
    public static int calculateSum(int l, int r) {
        int sum = 0;  // Initialize the sum to 0
        
        // Loop through the range and calculate the sum
        for (int i = l; i <= r; i++) {
            sum += i;  // Add each number in the range to the sum
        }
        
        return sum;  // Return the sum of numbers
    }
}

public class Main {

 