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**** Build of configuration Release for project bugTest ****

mingw32-make -k all
Building file: ../main.cpp
Invoking: GNU C++ Compiler
m68k-elf-g++ -m5206e -O2 -gdwarf-2 -fno-rtti -fno-exceptions -I"C:\Nburn\include_nn" -I"C:\Nburn\MOD5213\include" -I"C:\Nburn\gcc-m68k\include\c++\3.4.2" -I"C ...

Hello Tod,

Hope you are not mad at me. I've been tied up by another project lately, sorry for the late reply.
I have reproduced the error based on your code snippet.

void TestAgain()
{
#define MAXADCCNTS 4095.0
float a = -1.0;
float b = -1.0;
char range = 0;

a = atof("-1.0");
b = atof("-1 ...

Hello, Tod.
Thank you for your info.
Currently I cast the denomenator to float, and that fixes the error.
My guess is that the calculation of (float)0.0/( double ) expression is the mistaken, since (float)0.0/( float )expression is correct.
I can not use your code directely without lots of mods ...

Just want to answer rnixon's question, sorry for the confusion.

What I mean is that the following statements are the same, and will give me wrong results:
x = (a - b) / (double)(MAXADCCNTS - ((range == 1) ? 819.0 : 0.0));
x = (a - b) / (MAXADCCNTS - ((range == 1) ? 819.0 : 0.0));

and I said ...

Thanks.
Mine is rel20_rc_4.

Thanks for all the replies.

I also tried casting to double as follows. This code gives the same error as without casting.
I guess it might be the defects in the compiler.
I understand that using "const float MAXADCCNTS = 4095.0;" is better practice.
But i don't think it will solve my problem ...

Casting does correct it, but don't know why? BTW, a=-1.0, b=-1.0;
x= -166194084 without casting.

x = (a - b) / (float)(MAXADCCNTS - ((range == 1) ? 819.0 : 0.0));

#define MAXADCCNTS 4095.0

Hello every friends here,

It's been a long time I have not posted questions. However lately I found some bugs in the firmware I developed for the MOD5213 module. Apparently the atof() function convert "-0.0" to -2.0 instead of 0.0.

Also the following code gave me a huge negative number instead of ...

Thanks for your replies.
But what about dynamic variables? I do have dynamic variables used in my code.
Since the compiler does not know how much dynamic memory needed at runtime, the program still can crash even though the compiling is successful. right?
And what about the stacks?

BTW, since my ...