isdigit()

IMPORT_C int isdigit(int c);

Description

Tests whether the character is a standard decimal digit. For Unicode, this function returns TRUE only for the digits '0'...'9' (U+0030...U+0039), not for other digits in scripts like Arabic, Tamil, etc.

Parameters

int c an integer whose value is representable as an unsigned char.

Return value

int True, if the character is a standard decimal digit; false, otherwise.