Question

What is wrong with the following piece of code? int sample_array[10]; for (int index = 1; index <= 10; index++) sample_array[index] = 3*index;

Short answer

Answer: The main issues with the given code snippet are an incorrect starting index and an out-of-bounds error. The loop should start with `index = 0` instead of 1, and it should run as long as `index < 10` rather than `index <= 10`. A corrected version of the code is: ```cpp int sample_array[10]; for (int index = 0; index < 10; index++) sample_array[index] = 3*index; ```

Step-by-step solution

Identify the indexing problem

In C++, array indexing starts at 0, meaning that the first element of an array is accessed with an index of 0, not 1. The loop in the given code starts with `index = 1`, which means it skips updating the first element of the array.

Point out the out-of-bounds error

Another issue with the code is that it has an out-of-bounds error. The loop runs as long as `index <= 10`. Given that the length of the array is 10, the maximum valid index is 9 (0 through 9). So, when `index = 10`, the code attempts to write to an invalid location (`sample_array[10]`) that is not part of the array.

Propose a corrected version of the code

Here's a corrected version of the code snippet, taking into account the indexing issues: ```cpp int sample_array[10]; for (int index = 0; index < 10; index++) sample_array[index] = 3*index; ```