> For the complete documentation index, see [llms.txt](https://42-guide.gitbook.io/42-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://42-guide.gitbook.io/42-guide/piscine-life/c02.md).

# C02

#### **C Piscine C02**

In this module, you’ll deepen your understanding of string manipulation, character classification, and basic transformations in C. This section focuses on building fundamental string-processing functions, teaching you how to efficiently analyze, modify, and validate string data.

***

#### **What You'll Learn:**

1. **String Validation:**
   * Identify whether strings contain specific types of characters (alphabetic, numeric, printable, etc.).
2. **String Transformation:**
   * Perform operations like converting strings to uppercase, lowercase, or capitalizing words.
3. **Reproducing Standard Library Functions:**
   * Implement versions of standard C functions like `strlcpy` and `strcpy`.
4. **Advanced Output:**
   * Handle non-printable characters and memory display in hexadecimal format.

***

#### **Projects in This Section:**

1. **ft\_strcpy:** Reproduce the behavior of `strcpy` to copy a string from `src` to `dest`.
2. **ft\_strncpy:** Implement `strncpy` to copy up to `n` characters from `src` to `dest`.
3. **ft\_str\_is\_alpha:** Validate that a string contains only alphabetic characters.
4. **ft\_str\_is\_numeric:** Check if a string contains only numeric digits.
5. **ft\_str\_is\_lowercase:** Ensure a string consists only of lowercase characters.
6. **ft\_str\_is\_uppercase:** Verify a string contains only uppercase characters.
7. **ft\_str\_is\_printable:** Determine if a string has only printable characters.
8. **ft\_strupcase:** Transform all characters in a string to uppercase.
9. **ft\_strlowcase:** Convert all characters in a string to lowercase.
10. **ft\_strcapitalize:** Capitalize the first letter of every word in a string.
11. **ft\_strlcpy:** Reproduce `strlcpy` for safe string copying with a size limit.
12. **ft\_putstr\_non\_printable:** Print a string, replacing non-printable characters with their hexadecimal representation.
13. **ft\_print\_memory:** Display memory in a formatted manner with hexadecimal and printable characters.


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