C++ reference C reference Reference map

Ranges Algorithms Containers Strings Input/output

Search

Min standard

Theme

Keyboard

Press ? for shortcuts.

Code Ligatures

Pinned

Home / C++ / Header / Cctype

Standard library header <cctype>

Min standard notice:

This header was originally in the C standard library as <ctype.h>.

Build: 2026-03-06 · Pages: 6276

Contribute Edit page •Open issue

Keyboard shortcuts

? Open shortcuts
S Open bookmark spotlight
b Toggle bookmark
/ Focus search
Esc Close dialogs/menus
j Scroll down (Vim mode)
k Scroll up (Vim mode)
g g Go to top (Vim mode)
G Go to bottom (Vim mode)

Bookmarks

Enter: open · ↑/↓: move · Backspace/Delete: remove selected when query is empty