marty@wuphys.wustl.edu (Marty Olevitch) (06/12/90)
Here is something I've just noticed in using the atof() library routine in
Turbo C 2.0. When the following test program is compiled with the "-DWEIRD"
option, the correct answer is printed. However, when "WEIRD" is not
#defined, the error message "scanf : floating point formats not linked" is
printed at runtime. Does the compilation of the sscanf() load in some other
code needed for atof()? If so, how do I get this code loaded without the
dummy call to sscanf() (which in the example is never executed).
Thanks,
Marty Olevitch Internet: marty@wuphys.wustl.edu
Washington University UUCP: uunet!wugate!wuphys!marty
Physics Department, Campus Box 1105 Bitnet: marty@wuphys.WUSTL
St Louis MO 63130 USA Tel: (314) 889-6285
/* atoftest */
#include <stdlib.h>
main()
{
char s[10];
double a;
int yuck;
sprintf(s," 1.00");
#ifdef WEIRD
yuck = 0;
if(yuck == 1)
sscanf(s, "%f", &a);
#endif
a = atof(s);
printf("%f\n", a);
}jfbruno@rodan.acs.syr.edu (John Bruno) (06/12/90)
In article <1990Jun11.195944.26213@wuphys.wustl.edu> marty@wuphys.UUCP (Marty Olevitch) writes: >Here is something I've just noticed in using the atof() library routine in >Turbo C 2.0. When the following test program is compiled with the "-DWEIRD" >option, the correct answer is printed. However, when "WEIRD" is not >#defined, the error message "scanf : floating point formats not linked" is ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >printed at runtime. Does the compilation of the sscanf() load in some other >code needed for atof()? If so, how do I get this code loaded without the >dummy call to sscanf() (which in the example is never executed). > >Thanks, > >Marty Olevitch Internet: marty@wuphys.wustl.edu >Washington University UUCP: uunet!wugate!wuphys!marty >Physics Department, Campus Box 1105 Bitnet: marty@wuphys.WUSTL >St Louis MO 63130 USA Tel: (314) 889-6285 > > [Short program that calls atof() deleted] Page 380 Turbo-C User's Guide (Using Floating Point Libraries) ---jb
silver@xrtll.uucp (Hi Ho Silver) (06/16/90)
In article <1990Jun11.195944.26213@wuphys.wustl.edu> marty@wuphys.UUCP (Marty Olevitch) writes:
$Here is something I've just noticed in using the atof() library routine in
$Turbo C 2.0. When the following test program is compiled with the "-DWEIRD"
$option, the correct answer is printed. However, when "WEIRD" is not
$#defined, the error message "scanf : floating point formats not linked" is
$printed at runtime. Does the compilation of the sscanf() load in some other
$code needed for atof()? If so, how do I get this code loaded without the
$dummy call to sscanf() (which in the example is never executed).
I believe the usual solution to this is to include a line of the form
exp (1);
in your code (any floating-point math call will do). This forces the
floating point code to be linked in.
--
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