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Added comprehensive documentation for the C++ fpclassify() math function.

Description

This PR adds a new term entry for fpclassify() under the C++ math-functions concept, providing complete documentation including syntax, parameters, return values, and examples.

What's Included

  • Description and syntax details
  • Return value explanations (FP_INFINITE, FP_NAN, FP_ZERO, FP_SUBNORMAL, FP_NORMAL)
  • Working example with multiple test cases
  • Interactive codebyte example for hands-on learning

Type of Change

  • Adding a new entry

Checklist

  • All writings are my own
  • My entry follows the Codecademy Docs style guide
  • My changes generate no new warnings
  • I have performed a self-review of my own writing and code
  • I have checked my entry and corrected any misspellings
  • I have made corresponding changes to the documentation if needed
  • I have confirmed my changes are not being pushed from my forked main branch
  • I have confirmed that I'm pushing from a new branch named after the changes I'm making
  • I have linked any issues that are relevant to this PR in the "Issue Solved" section

Closes #7990

Added comprehensive documentation for the fpclassify() math function.

Includes:
- Description and syntax
- Return value details (FP_INFINITE, FP_NAN, FP_ZERO, FP_SUBNORMAL, FP_NORMAL)
- Example with multiple classifications
- Runnable codebyte example

Closes Codecademy#7990
@mamtawardhani mamtawardhani self-assigned this Nov 21, 2025
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[Term Entry] C++ Math-functions: fpclassify()

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