ISASCII(3) | Library Functions Manual | ISASCII(3)

# NAME

`isascii` — ASCII character test

# SYNOPSIS

`#include <ctype.h>`

int
`isascii`(int c);

# DESCRIPTION

The `isascii`() function tests for an ASCII character, which is any character in the range from 0 to 0177, inclusive.

# RETURN VALUES

The `isascii`() function returns zero if the character tests false or non-zero if the character tests true.

# SEE ALSO

isalnum(3), isalpha(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)

# STANDARDS

The `isascii`() function conforms to X/Open Portability Guide Issue 4 (“XPG4”).

# HISTORY

The `isascii`() function first appeared in Version 7 AT&T UNIX.

June 29, 2021 | Debian