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isalnum

Summary
#include <ctype.h>

int isalnum (
  int c);   /* character to test */
Description

The isalnum function tests c to determine if it is an alphanumeric character ('A'-'Z', 'a'-'z', or '0'-'9').

Return Value

The isalnum function returns a value of 1 if c is an alphanumeric character or a value of 0 if it is not.

See Also

isalpha, iscntrl, isdigit, isgraph, islower, isprint, ispunct, isspace, isupper, isxdigit

Example
#include <ctype.h>
#include <stdio.h> /* for printf */

void tst_isalnum (void) {
  unsigned char i;
  char *p;

  for (i = 0; i < 128; i++) {
    p = (isalnum (i) ? "YES" : "NO");

    printf ("isalnum (%c) %s\n", i, p);
  }
}
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