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isdigit.c
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C/C++ Source or Header
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1988-07-30
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1KB
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55 lines
/************************************************************************
* *
* Copyright (c) 1982, Fred Fish *
* All Rights Reserved *
* *
* This software and/or documentation is released for public *
* distribution for personal, non-commercial use only. *
* Limited rights to use, modify, and redistribute are hereby *
* granted for non-commercial purposes, provided that all *
* copyright notices remain intact and all changes are clearly *
* documented. The author makes no warranty of any kind with *
* respect to this product and explicitly disclaims any implied *
* warranties of merchantability or fitness for any particular *
* purpose. *
* *
************************************************************************
*/
/*
* LIBRARY FUNCTION
*
* isdigit test character for numeric property
*
* SYNOPSIS
*
* int isdigit(ch)
* char ch;
*
* DESCRIPTION
*
* Returns TRUE or FALSE depending upon whether the specified
* character is a numeric character or not.
*
* BUGS
*
* May fail on machines in which native character set is not ASCII.
*
*/
#include <stdio.h>
#define TRUE 1
#define FALSE 0
int isdigit(ch)
char ch;
{
if (ch > '9' || ch < '0') {
return(FALSE);
} else {
return(TRUE);
}
}