pc-hack

PC HACK 3.61 source code (archival)
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isdigit.c (1302B)

      1 /************************************************************************
      2  *									*
      3  *			Copyright (c) 1982, Fred Fish			*
      4  *			    All Rights Reserved				*
      5  *									*
      6  *	This software and/or documentation is released for public	*
      7  *	distribution for personal, non-commercial use only.		*
      8  *	Limited rights to use, modify, and redistribute are hereby	*
      9  *	granted for non-commercial purposes, provided that all		*
     10  *	copyright notices remain intact and all changes are clearly	*
     11  *	documented.  The author makes no warranty of any kind with	*
     12  *	respect to this product and explicitly disclaims any implied	*
     13  *	warranties of merchantability or fitness for any particular	*
     14  *	purpose.							*
     15  *									*
     16  ************************************************************************
     17  */
     18 
     19 
     20 /*
     21  *  LIBRARY FUNCTION
     22  *
     23  *	isdigit    test character for numeric property
     24  *
     25  *  SYNOPSIS
     26  *
     27  *	int isdigit(ch)
     28  *	char ch;
     29  *
     30  *  DESCRIPTION
     31  *
     32  *	Returns TRUE or FALSE depending upon whether the specified
     33  *	character is a numeric character or not.
     34  *
     35  *  BUGS
     36  *
     37  *	May fail on machines in which native character set is not ASCII.
     38  *
     39  */
     40 
     41 #include <stdio.h>
     42 
     43 #define TRUE 1
     44 #define FALSE 0
     45 
     46 int isdigit(ch)
     47 char ch;
     48 {
     49     if (ch > '9' || ch < '0') {
     50 	return(FALSE);
     51     } else {
     52 	return(TRUE);
     53     }
     54 }