isdigit.c File Reference

#include <ctype.h>

Include dependency graph for isdigit.c:

Go to the source code of this file.

Functions
int	isdigit (int c)
	Checks if the given character is a numeric character. More...

Function Documentation

isdigit()

int isdigit

(

int

ch

)

Checks if the given character is a numeric character.

Checks if the given character is a numeric character (0123456789).

The behavior is undefined if the value of ch is not representable as unsigned char and is not equal to EOF.

Parameters

ch	The character to classify

Returns

Non-zero value if the character is a numeric character, zero otherwise.

Definition at line 5 of file isdigit.c.

{
    return (unsigned)c - '0' < 10;
}

Referenced by atoi(), atol(), atoll(), isalnum(), isxdigit(), strtol(), strtoll(), and strtoul().

Here is the caller graph for this function: