C ctype isdigit() Function
Example
Check if a character is a digit:
char c = '8';
if (isdigit(c)) {
printf("%c is a digit", c);
} else {
printf("%c is not a digit", c);
}
Definition and Usage
The isdigit() function returns a non-zero value (equivalent to boolean
true) if the
character is a digit.
The isdigit() function is defined in the <ctype.h> header file.
Syntax
int isdigit(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 decimal digit.Otherwise it returns 0 (equivalent to boolean false). |
|---|