range sum

To calculate the range sum in C++, you can follow these steps:

1. Declare an array: Start by declaring an array of integers. You can do this by specifying the data type (int) followed by the name of the array and its size. For example, int arr[5]; declares an array named arr with a size of 5.

2. Initialize the array: Initialize the array elements with the desired values. You can assign values to individual elements using the index notation. For example, arr[0] = 10; assigns the value 10 to the first element of the array.

3. Calculate the range sum: To calculate the range sum, you need to define the range of elements you want to sum. This can be done using two variables, start and end, that represent the start and end indices of the range. For example, int start = 2; int end = 4; defines a range from the third element to the fifth element of the array.

4. Iterate over the range: Use a loop to iterate over the elements within the specified range. You can use a for loop with a counter variable that starts from the start index and ends at the end index. For example, for (int i = start; i <= end; i++) { // Code inside the loop }.

5. Accumulate the sum: Inside the loop, accumulate the sum by adding each element to a sum variable. You can use the += operator to add each element to the sum. For example, sum += arr[i];.

6. Display the range sum: Finally, display the range sum. You can use the cout statement to print the value of the sum variable. For example, cout << "Range Sum: " << sum;.

Remember to include the necessary header files, such as iostream, and to end the program with a return statement.