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Re: [avr-gcc-list] FP Library

From: Ron Kreymborg
Subject: Re: [avr-gcc-list] FP Library
Date: Mon Feb 5 10:14:04 2001

Further to my earlier request about the "undefined" dtostre and atof
functions, here is a small test program that can be easily cut and pasted
for testing.

#include <stdlib.h>
int main(void);
const char *number = "0.487467";
char result[20];
int main(void)
   float theNumber;
   // Convert ascii to floating point
   theNumber = (float)atof(number);
   // Convert back to a scientific format.
   dtostre(theNumber, output, 4, 0x6);
   // This should leave "+4.8747E-01" in result.
   return 0;

My bare bones test compile and link lines were:

avr-gcc -c -mmcu=atmega103 test_dtostre.c -o test_dtostre.o

avr-gcc test_dtostre.o -lm -o test_dtostre.elf

I would appreciate any clues here if it is something I am doing wrong.


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