Isdigit (test whether the character is Arabic numerals)

/* Isdigit (test whether the character is an Arabic number) related function isxdigit header file # include <ctype. h> define the int isdigit (INT c) function to check whether the value of parameter C is 0 to 9. If the return value is an Arabic number, true is returned. Otherwise, null (0) is returned ). This is a macro definition, not a real function. Example * // * Find the Arabic character in the STR string */# include <ctype. h> # include <stdio. h> main () {char STR [] = "[email protected] # FDSP [E? "; Int I; for (I = 0; STR [I]! = 0; I ++) if (isdigit (STR [I]) printf ("% C is an digit character \ n", STR [I]);} /* Run 1 is an digit character2 is an digit character3 is an digit character */

 

Isdigit (test whether the character is Arabic numerals)