[net.micro.amiga] Floating point routines with Lattice V3.03 - Questions ??

normc@tekigm2.UUCP (Norm Church) (03/11/86)

To: net.micro.amiga
Cc: normc
Subject: Floating Point with Lattice V3.03 - Question ?


     I am having a problem using the floating point
function with the Lattice Version 3.03 compiler on
my Amiga.  I don't know if the problem is in my code
or something else in the system.

     I have listed the sample program below and would
appreciate any help available to get me headed in the
right direction.

/* float2.c  test floating point in V3.03 */
#include <stdio.h>
main()
{
float f1;
char ans[50];
	printf("\nInput ascii to float value ");
	scanf("%s", ans);
        f1=atof(ans);
	printf("\n%g", f1);
	printf("\n%f", f1);
	printf("\n%e", f1);

 	printf("\nInput floating point value ");
	scanf("%f", f1);
	printf("\n%g", f1);
	printf("\n%f", f1);
	printf("\n%e\n", f1);
}
------------------------------
     The results in each case was some very
large number that appeared to be a constant.
I don't have the actual results with me at
the moment but the conversion didn't work
and I don't know what I am doing wrong.
   
Thanks for you help,

Norm

dillon@CORY.BERKELEY.EDU (Matt Dillon) (03/12/86)

	I don't have stdio.h with me at the moment.  I don't think it 
extern's atof().  Therefore, you should have the following line:


	extern double atof();

	In any case, if you didn't extern it,  lattice would think atof()
returned an INT, and attempt to convert INT->FLOAT before assigning it to
your variable.   Needless to say, this is why you are getting such strange
numbers.

				-Matt