Character tests and case conversion for C++ macros. More...
| int | isalnum(int c) |
| int | isalpha(int c) |
| int | iscntrl(int c) |
| int | isdigit(int c) |
| int | isgraph(int c) |
| int | islower(int c) |
| int | isprint(int c) |
| int | ispunct(int c) |
| int | isspace(int c) |
| int | isupper(int c) |
| int | isxdigit(int c) |
| int | tolower(int c) |
| int | toupper(int c) |
Character tests and case conversion for C++ macros. Load with #include <ctype.h> or #include <cctype> (same plugin). Available from LayoutEditor 20260918.
These functions do not take a LayoutEditor string. They take a character code: a whole number that stands for one character in the usual 7-bit ASCII table.
In a macro, 'A' is a string, not a character. Do not write isalpha('A'). Pass the code instead:
| Character | Code |
|---|---|
'0' … '9' |
48 … 57 |
'A' … 'Z' |
65 … 90 |
'a' … 'z' |
97 … 122 |
| space | 32 |
| newline | 10 |
You can also take the first byte of a string if you already have one character in a variable of type int.
The is… functions return non-zero when the test is true, and 0 when it is false. In an if that is enough: if (isdigit(48)) { … }.
Locale-dependent (national) character sets are not bound.
#include <ctype.h>
int main(){
if (!isdigit(48)) return 1; // '0'
if (!isalpha(65)) return 1; // 'A'
int up = toupper(97); // 'a' → 65 ('A')
cout("toupper('a') = ", up, "\n");
}True if c is a letter or a digit (A–Z, a–z, 0–9).
Parameters:
c (int) — character code.Returns: non-zero if alphanumeric, otherwise 0.
True if c is a letter (A–Z or a–z).
Parameters:
c (int) — character code.Returns: non-zero if a letter, otherwise 0.
True if c is a control character (codes 0–31 and 127: tab, newline, bell, … — not a visible glyph).
Parameters:
c (int) — character code.Returns: non-zero if a control character, otherwise 0.
True if c is a decimal digit 0–9 (codes 48–57).
Parameters:
c (int) — character code.Returns: non-zero if a digit, otherwise 0.
True if c is a visible character except space (letters, digits, punctuation).
Parameters:
c (int) — character code.Returns: non-zero if visible and not space, otherwise 0.
True if c is a lowercase letter a–z.
Parameters:
c (int) — character code.Returns: non-zero if lowercase, otherwise 0.
True if c is printable, including space (code 32 and visible glyphs).
Parameters:
c (int) — character code.Returns: non-zero if printable, otherwise 0.
True if c is punctuation (printable, but neither letter, digit, nor space): ., ,, !, (, …
Parameters:
c (int) — character code.Returns: non-zero if punctuation, otherwise 0.
True if c is white space: space, tab (9), newline (10), vertical tab (11), form feed (12), carriage return (13).
Parameters:
c (int) — character code.Returns: non-zero if white space, otherwise 0.
True if c is an uppercase letter A–Z.
Parameters:
c (int) — character code.Returns: non-zero if uppercase, otherwise 0.
True if c is a hexadecimal digit: 0–9, A–F, a–f.
Parameters:
c (int) — character code.Returns: non-zero if a hex digit, otherwise 0.
Converts an uppercase letter to lowercase. Other codes are returned unchanged.
Parameters:
c (int) — character code (65 for 'A').Returns: int — the converted code. tolower(65) is 97 ('a'). tolower(48) is 48 ('0' stays a digit).
Converts a lowercase letter to uppercase. Other codes are returned unchanged.
Parameters:
c (int) — character code (97 for 'a').Returns: int — the converted code. toupper(97) is 65 ('A').
Python: c.isdigit(), c.isalpha(), c.upper(). This include is for C++ macros only.