Eric Postpischil

Eric Postpischil has asked 36 questions and find answers to 939 problems.

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About

Senior software engineer in Apple’s Vector and Numerics Group (retired).

Eric Postpischil questions

Why do GCC and Clang produce different output with variable length array?
How to fix "variable previously declared 'static' redeclared 'extern' error"? [duplicate]
Is an fscanf/scanf/sscanf conversion specification with assignment suppressed not a conversion?
Is GCC warning on const qualifier correct?
Is assigning to a union member from a different member in the same union defined by the C standard?
Why is _Alignof missing from the rule about converting an array to a pointer?
Why was SIGFPE used for integer arithmetic exceptions?
Is a redeclaration of an untagged structure a compatible type?
May C evaluate with multiple floating-point formats?
How are multiple prior declarations resolved for a new declaration with extern?

Eric Postpischil answers

Difference Between %f and %F in printf()?
The Usual Arithmetic Conversions in "C Programming: A modern approach"
Apply FFT to a both channels of a stereo signal separately?
Is the size of a union equal to the size of its member of the largest size?
Are the addresses displayed by objdump final addresses or just offsets?
What does __attribute__((packed)) do to a union?
If x*y ≠ 2ⁿ, does it follow that x * y = ((x * y) / y) * y under IEEE 754 semantics?
The rounding mode of floating point numbers in C language When the mantissa of a floating point number exceeds 23 bits how to round the excess part
What is the closest value to 1/3 that can be achieved using IEEE 754 32-bit floating point format?
Can function pointers point to functions with differing argument const-ness in C