Comments (2)
Thanks for your response, and for the test suite! The tests have proven very useful in verifying our Java implementation of sprintf()!
from printf.
Hello Alex,
thanks a lot for your investigation and bringing this to attention.
I know that the float conversion ain't really pretty and even lacks exponential support. It's still a kind of workaround and perhaps I get some help from @ckormanyos in the wintertime to improve the floating-point conversion.
So, yeah, the testcase you mentioned is actually a valid one for this printf implementation, because the precision of 10 is silently limited to 9 digits, so having "%.10f" returns 9 digits after the point. That is expected here - but I agree, this is not the correct way and may be considered as a bug.
And I should mention this explicit in the readme.
Anyway, I fix this and return the given number of precision digits while returning zeros after the 9th digit.
The testcase above will become
test::sprintf(buffer, "%.12f", 42.89522312345678);
REQUIRE(!strcmp(buffer, "42.895223123000"));
then.
This is not perfect as well, but better than returning a wrong precision.
from printf.
Related Issues (20)
- Use more appropriate types for base, precision and width HOT 4
- Avoid geneal-case division and modulus in _ntoa functions
- Undefined behavior on INT_MIN HOT 1
- Proper handling of denormals
- printf_("%.1e", 9.96) prints "10.0e+00", should print "1.0e+01"
- Printing +/-0 with "%g" doesn't fall back to decimal mode
- More cases of "%g" not falling back to decimal mode
- Support for FreeRTOS lxip specifier HOT 1
- Siginificant-digits-to-precision transition made invalid by rounding
- Floating point printing - how?
- Vfctprintf
- could you support %I64d %I64u like msvc done? HOT 1
- [notice] https://github.com/eyalroz/printf <-This repo is maintaining HOT 8
- Zero padding disabled when precision specified HOT 3
- this is incredible HOT 6
- WebAssembly HOT 2
- GCC flags for freestanding? HOT 2
- for declaration not compatible with C compilers HOT 1
- _vsnprintf reads past the format parameter value HOT 6
- I've created an Arduino Library from your source code HOT 4
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from printf.