Output formatting incorrect

[khlevin]

Expected to be cleanly formatted, but is not.

The root cause of this error is that the variable `x` is initialized
to 1.0, and then iteratively multiplied by `i` in the `for` loop in
the `fact` function. However, the loop starts from `i = 0.0`, which
means that `x` will always be multiplied by 0 in the first iteration,
resulting in `x` being 0.0. The subsequent `assert` statement checks
if `x` is not equal to 0.0, which will always fail.

To fix this error, we need to initialize `x` to 1.0 instead of 0.0.
This can be done by changing the initialization of `i` in the `for`
loop to start from 1.0 instead of 0.0.

Fixed source code: ``` /* frame 0 */ /* frame 1 */ /* frame 2 */ /*
frame 3 */ /* frame 4 */ #include <assert.h> #include <iostream>

float fact(float n) {   auto x = 1.0;   for (auto i = 1.0; i < n; i++)
{     x *= i;   }   assert(x != 0.0);   ^-----------------------------
------------------------------------------------ /* frame 5 */   for
(auto i = 1.0; i < n; i++) {     x *= i;   }   assert(x != 0.0);
return x; }


int main()
{
  std::cout << fact(100) << std::endl;
  ^-----------------------------------------------------------------------------
      ```

With this fix, `x` will correctly accumulate the product of `i`
values, starting from 1 instead of 0, and the `assert` statement will
not fail.

[nicovank]

This is how we do it in CWhy: https://github.com/plasma-umass/cwhy/blob/fb99b7a07eea88a857281d0fb04997622ad1cf44/src/cwhy/cwhy.py#L13-L57

[emeryberger]

ChatDBG uses the same code, modulo single-quotes vs. double-quotes (

ChatDBG/src/chatdbg/chatdbg_utils.py

Lines 22 to 65 in ad4624d

	def word_wrap_except_code_blocks(text: str) -> str:
	"""Wraps text except for code blocks.
	Splits the text into paragraphs and wraps each paragraph,
	except for paragraphs that are inside of code blocks denoted
	by ` ``` `. Returns the updated text.
	Args:
	text: The text to wrap.
	Returns:
	The wrapped text.
	"""
	# Split text into paragraphs
	paragraphs = text.split('\n\n')
	wrapped_paragraphs = []
	# Check if currently in a code block.
	in_code_block = False
	# Loop through each paragraph and apply appropriate wrapping.
	for paragraph in paragraphs:
	# If this paragraph starts and ends with a code block, add it as is.
	if paragraph.startswith('```') and paragraph.endswith('```'):
	wrapped_paragraphs.append(paragraph)
	continue
	# If this is the beginning of a code block add it as is.
	if paragraph.startswith('```'):
	in_code_block = True
	wrapped_paragraphs.append(paragraph)
	continue
	# If this is the end of a code block stop skipping text.
	if paragraph.endswith('```'):
	in_code_block = False
	wrapped_paragraphs.append(paragraph)
	continue
	# If we are currently in a code block add the paragraph as is.
	if in_code_block:
	wrapped_paragraphs.append(paragraph)
	else:
	# Otherwise, apply text wrapping to the paragraph.
	wrapped_paragraph = textwrap.fill(paragraph)
	wrapped_paragraphs.append(wrapped_paragraph)
	# Join all paragraphs into a single string
	wrapped_text = '\n\n'.join(wrapped_paragraphs)
	return wrapped_text

).

[emeryberger]

Pushed an updated version that correctly handles the above case.

---

The root cause of this error is that the variable x is initialized
to 1.0, and then iteratively multiplied by i in the for loop in
the fact function. However, the loop starts from i = 0.0, which
means that x will always be multiplied by 0 in the first iteration,
resulting in x being 0.0. The subsequent assert statement checks
if x is not equal to 0.0, which will always fail.

To fix this error, we need to initialize x to 1.0 instead of 0.0.
This can be done by changing the initialization of i in the for
loop to start from 1.0 instead of 0.0.

Fixed source code:

 /* frame 0 */ /* frame 1 */ /* frame 2 */ /*
frame 3 */ /* frame 4 */ #include <assert.h> #include <iostream>

float fact(float n) {   auto x = 1.0;   for (auto i = 1.0; i < n; i++)
{     x *= i;   }   assert(x != 0.0);   ^-----------------------------
------------------------------------------------ /* frame 5 */   for
(auto i = 1.0; i < n; i++) {     x *= i;   }   assert(x != 0.0);
return x; }


int main()
{
  std::cout << fact(100) << std::endl;
  ^-----------------------------------------------------------------------------
      

With this fix, x will correctly accumulate the product of i
values, starting from 1 instead of 0, and the assert statement will
not fail.