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/*
* Copyright (c) 1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND CARNEGIE MELLON UNIVERSITY
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT
* SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Users of this software agree to return to Carnegie Mellon any
* improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* Export of this software is permitted only after complying with the
* regulations of the U.S. Deptartment of Commerce relating to the
* Export of Technical Data.
*/
/* getdouble -- prompt user for double
*
* Usage: f = getdouble (prompt,min,max,defalt)
* double f,min,max,defalt;
* char *prompt;
*
* Getdouble prints the message: prompt (min to max) [defalt]
* and accepts a line of input from the user. If the input
* is not null or numeric, an error message is printed; otherwise,
* the value is converted to a double (or the value "defalt" is
* substituted if the input is null). Then, the value is
* checked to ensure that is lies within the range "min" to "max".
* If it does not, an error message is printed. As long as
* errors occur, the cycle is repeated; when a legal value is
* entered, this value is returned by getdouble.
* On end-of-file or read error in the standard input, the default
* is returned.
*
* HISTORY
* $Log: getdouble.c,v $
* Revision 1.2 90/12/11 17:54:05 mja
* Add copyright/disclaimer for distribution.
*
* 28-Apr-85 Steven Shafer (sas) at Carnegie-Mellon University
* Modified for 4.2 BSD. Now uses stderr for output.
*
* 23-Oct-82 Steven Shafer (sas) at Carnegie-Mellon University
* Added code to return default on EOF or error in standard input.
*
* 20-Nov-79 Steven Shafer (sas) at Carnegie-Mellon University
* Created for VAX.
*
*/
#include <stdio.h>
#include <ctype.h>
#include <math.h>
double getdouble (prompt,min,max,defalt)
double min,max,defalt;
char *prompt;
{
char input [200];
register char *p;
register int err;
double i;
fflush (stdout);
do {
fprintf (stderr,"%s (%g to %g) [%g] ",prompt,min,max,defalt);
fflush (stderr);
err = 0;
if (gets(input) == NULL) {
i = defalt;
err = (i < min || max < i);
}
else {
for (p=input; *p &&
(isdigit(*p) || *p=='-' || *p=='.' || *p=='+'
|| *p=='e' || *p=='E');
p++);
if (*p) { /* non-numeric */
err = 1;
} else {
if (*input) i = atof (input);
else i = defalt;
err = (i < min || max < i);
}
}
if (err) fprintf (stderr,"Must be a number between %g and %g\n",
min,max);
} while (err);
return (i);
}
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