| Function | Header File | Page | Description |
|---|---|---|---|
| tolower() | ctype.h | tolower() – toupper() — Convert Character Case | Converts a character to lowercase. |
| toupper() | ctype.h | tolower() – toupper() — Convert Character Case | Converts a character to uppercase. |
| towlower() | ctype.h | towlower() –towupper() — Convert Wide Character Case | Converts a wide character to lowercase. |
| towupper() | ctype.h | towlower() –towupper() — Convert Wide Character Case | Converts a wide character to uppercase. |