Omnimaga
Calculator Community => TI Calculators => Calculator C => Topic started by: Vogtinator on December 24, 2012, 12:11:58 pm
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I was just fiddling with some sine and cosine tables and needed some debugging.
But the output was always "0.00000". I tried to execute
float oneandahalf = 1.5f;
double twoandahalf = 2.5;
int one = 1;
char str[60];
sprintf(str, "1.5: %f 2.5: %f 1: %d", oneandahalf, twoandahalf, one);
show_msgbox(str, str);It compiles fine, result:
(http://i.imgur.com/wD9lj.png)
Dafuq is going on there :o
Same result with nspire_emu.
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Lolwut? O.O
I was trying to debug float values too, and was also getting a similar wierd problem D:
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See if this works:
sprintf(str, "1.5: %f 2.5: %f 1: %d", 1.5, 2.5, 1);
It may at the very least narrow down the bug.
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Nope, no change.
sprintf(str, "1: %d 2.5: %f 1.5: %f", 1, 2.5f, 1.5);prints: "1: 1 1.5: 0.000000 2.5: 0.000000".
Seems to be some kind of issue with va_list's and aligning, doesn't it?
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Nope, no change.
sprintf(str, "1: %d 2.5: %f 1.5: %f", 1, 2.5f, 1.5);prints: "1: 1 1.5: 0.000000 2.5: 0.000000".
Seems to be some kind of issue with va_list's and aligning, doesn't it?
Yeah... looks like something is wrong with sprintf itself or some type of alignment issue.
You should report the bug and give the examples that you posted here.
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http://www.unsads.com/projects/nsptools/register (http://www.unsads.com/projects/nsptools/register)
Can't register..
Do I have to mail him?
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Maybe GCC and Nucleus / TI's code use different formats for floating-point values ?
(at least, TI's Lua and C do)
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You're passing a double to a %f specifier, that's a problem don't you think? Make it %lf for the double.
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Tried that, doesn't work.
But it shouldn't confuse va_list.
sprintf(str, "%d, %f, %lf", 1, 1.5f, 2.5);Should be fine I think.
Maybe GCC and Nucleus / TI's code use different formats for floating-point values ?
Is sprintf a syscall? Isn't it included in newlib?
Edit:
Gcc thinks "1.5f" is a double..
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Maybe GCC and Nucleus / TI's code use different formats for floating-point values ?
Is sprintf a syscall? Isn't it included in newlib?
sprintf is a syscall, yes. Ndless almost only uses syscalls and AFAIK doesn't use Newlib.
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sprintf is a syscall, yes. Ndless almost only uses syscalls and AFAIK doesn't use Newlib.
http://hackspire.unsads.com/wiki/index.php/C_and_assembly_development_introduction_on_Linux (http://hackspire.unsads.com/wiki/index.php/C_and_assembly_development_introduction_on_Linux)
But it gets build and gcc links against it.
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http://hackspire.unsads.com/wiki/index.php/Syscalls (http://hackspire.unsads.com/wiki/index.php/Syscalls) says Newlib is used for exit() and here (http://hackspire.unsads.com/wiki/index.php/Ndless_features_and_limitations#Newlib) it says it's also used for floating point (because there's no FPU). But most other parts of newlib don't work with Ndless.
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Wouldn't it be better to provide it directly with newlib?
It would be faster and there will be no such problems anymore.
Only disadvantage would be the increasing size of the binary.
Edit: Workaround: Use http://stackoverflow.com/questions/2302969/how-to-implement-char-ftoafloat-num-without-sprintf-library-function-i (http://stackoverflow.com/questions/2302969/how-to-implement-char-ftoafloat-num-without-sprintf-library-function-i).
The third answer works perfectly with floats, too.