Problem
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Sum of all even numbers in an array
Certification: Basic Level
Accuracy: 50%
Submissions: 36
Points: 5
Write a C# program to find the sum of all even numbers in a given integer array. The program should iterate through the array, identify even numbers, and compute their sum.
Example 1
- Input: arr = [1, 2, 3, 4, 5, 6]
- Output: 12
- Explanation:
- Step 1: Initialize a sum variable to 0.
- Step 2: Iterate through each element in the array.
- Step 3: Check if each element is even (divisible by 2).
- Step 4: For even numbers (2, 4, 6), add them to the sum.
- Step 5: Return the final sum: 2 + 4 + 6 = 12.
Example 2
- Input: arr = [7, 9, 11, 13]
- Output: 0
- Explanation:
- Step 1: Initialize a sum variable to 0.
- Step 2: Iterate through each element in the array.
- Step 3: Check if each element is even (divisible by 2).
- Step 4: No even numbers are found in the array.
- Step 5: Return the sum, which remains 0.
Constraints
- 1 ≤ array length ≤ 10^5
- -10^9 ≤ array elements ≤ 10^9
- Time Complexity: O(N)
- Space Complexity: O(1)
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Solution Hints
- Iterate Through Array: Loop through all elements of the array.
- Check Even Numbers: Use num % 2 == 0 to identify even numbers.
- Sum Calculation: Add even numbers to a running sum.
- Edge Case: Handle cases where no even numbers exist (return 0).