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What is the output of the following code snippet?
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
sum = 0
for row in arr:
for elem in row:
sum += elem
print(sum)
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
sum = 0
for row in arr:
for elem in row:
sum += elem
print(sum)
- a)9
- b)15
- c)45
- d)36
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
What is the output of the following code snippet?arr = [[1, 2, 3], [4,...
The code snippet calculates the sum of all elements in the 2D array. The sum will be 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45.
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Community Answer
What is the output of the following code snippet?arr = [[1, 2, 3], [4,...
Explanation:
The given code snippet initializes a 2-dimensional list called `arr` with three sublists, each containing three elements.
The variable `sum` is initialized to 0.
The code then enters a nested loop, with the outer loop iterating over each sublist in `arr` and the inner loop iterating over each element in the current sublist.
Within the inner loop, the variable `sum` is updated with the value of the current element in each iteration. However, instead of accumulating the sum, the variable `sum` is overwritten with the value of the current element.
After the nested loops complete execution, the value of `sum` will be the last element in the last sublist, which is 9.
Therefore, the output of the code snippet will be 9.
Answer: a) 9
The given code snippet initializes a 2-dimensional list called `arr` with three sublists, each containing three elements.
The variable `sum` is initialized to 0.
The code then enters a nested loop, with the outer loop iterating over each sublist in `arr` and the inner loop iterating over each element in the current sublist.
Within the inner loop, the variable `sum` is updated with the value of the current element in each iteration. However, instead of accumulating the sum, the variable `sum` is overwritten with the value of the current element.
After the nested loops complete execution, the value of `sum` will be the last element in the last sublist, which is 9.
Therefore, the output of the code snippet will be 9.
Answer: a) 9
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