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Sum of Elements in a Dynamically Allocated Array

Certification: Basic Level Accuracy: 87.5% Submissions: 16 Points: 5

Write a C++ program that finds the sum of elements in a dynamically allocated array.

Example 1
     
  • Input: arr = [1, 2, 3, 4, 5], size = 5
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  • Output: 15
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  • Explanation: 
       
    • Step 1: Dynamically allocate memory for an array of size 5.
      •  
    • Step 2: Initialize the array with the given values [1, 2, 3, 4, 5].
      •  
    • Step 3: Initialize a sum variable to 0.
      •  
    • Step 4: Iterate through the array using pointers and add each element to the sum.
      •  
    • Step 5: Return the sum value (1 + 2 + 3 + 4 + 5 = 15).
      •  
    •
Example 2
     
  • Input: arr = [10, 20, 30], size = 3
    •  
  • Output: 60
    •  
  • Explanation: 
       
    • Step 1: Dynamically allocate memory for an array of size 3.
      •  
    • Step 2: Initialize the array with the given values [10, 20, 30].
      •  
    • Step 3: Initialize a sum variable to 0.
      •  
    • Step 4: Iterate through the array using pointers and add each element to the sum.
      •  
    • Step 5: Return the sum value (10 + 20 + 30 = 60).
      •  
    •
Constraints
     
  • 1 ≤ size ≤ 10^6
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  • Use dynamic memory allocation
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  • Time Complexity: O(n) where n is the size of the array
    •  
  • Space Complexity: O(n) where n is the size of the array
    •
ArraysPointers and ReferencesCognizantWalmart
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Hint
Solution

Solution Hints

    
  
  • Allocate memory for the array dynamically.
    • 
  
  • Traverse the array and calculate the sum of its elements.
    • 
  
  • Ensure that the memory is properly deallocated after use.
    •

Steps to solve by this approach:

 Step 1: Define a function sum_array that takes an integer pointer and size as parameters.

 Step 2: Initialize a sum variable to zero.

 Step 3: Iterate through the array using a for loop from 0 to size-1.

 Step 4: Add each array element to the sum.

 Step 5: Return the final sum value.

 Step 6: In main, dynamically allocate an array with values.

 Step 7: Call sum_array with this array and its size, then print the result.

 Step 8: Free the dynamically allocated memory using delete[].

Submitted Code :