If you declare an array int arr[10];, what is the range of valid indexes for accessing elements of the array?0 to 101 to 100 to 91 to 9

1. ### Break Down the Problem

To determine the range of valid indexes for an array in C, we need to consider how arrays are structured in memory. When you declare an array, the indexes are zero-based, meaning they start from 0 up to one less than the number of elements declared.

2. ### Relevant Concepts

For an array declared as int arr[10];, it means that the array can hold 10 integers. The valid index range can be calculated as follows:

• The first index is 0.
• The last index is calculated as the size of the array minus one, which is $N - 1$, where $N$ is the total number of elements in the array.

3. ### Analysis and Detail

For int arr[10];:

• The first valid index is $0$.
• The last valid index is $10 - 1 = 9$.

Therefore, the valid index range for the array arr would be from 0 to 9.

4. ### Verify and Summarize

Thus, it’s verified that with an array of size 10, the valid index range includes 10 positions, starting from index 0 to index 9.

Final Answer

The range of valid indexes for accessing elements of the array int arr[10]; is 0 to 9.