C ctype iscntrl() Function
Example
Check if a character is a control character:
char c = '\n';
if (iscntrl(c)) {
printf("'%c' (ASCII value %d) is a control character", c, c);
} else {
printf("'%c' (ASCII value %d) is not a control character", c, c);
}
Definition and Usage
The iscntrl() function returns a non-zero value (equivalent to boolean
true) if
a character is a control character. Control characters are characters that provide instructions to text
processors and other programs.
Examples of common control characters are: \n (newline), \t (tab), \b
(backspace), etc.
The characters with an ASCII value less than 32 or equal to 127 are control characters.
The iscntrl() function is defined in the <ctype.h> header file.
Syntax
int iscntrl(int c);Parameter Values
| Parameter | Description |
|---|---|
| c | Required. The ASCII value of a character or an actual character |
Technical Details
| Returns: | An int value which is non-zero (equivalent to boolean
true) if the character is a control character.Otherwise it returns 0 (equivalent to boolean false). |
|---|