C++ program to calculate sum of all the elements in an array

C++ program to calculate the sum of all elements in an array:

Code:

#include <iostream>

using namespace std;

int main() {

  // Declare an array

  int arr[] = {1, 2, 3, 4, 5};

  // Calculate the length of the array

  int length = sizeof(arr) / sizeof(arr[0]);

  // Initialize sum

  int sum = 0;

  // Loop through the array and calculate the sum

  for (int i = 0; i < length; ++i) {

    sum += arr[i];

  }

  // Display the sum

  cout << "Sum of all elements in the array: " << sum << endl;

  return 0;

}

Output:

Sum of all elements in the array: 15

Time Complexity: O(n)