cfloating-pointlanguage-lawyerstandards
Can floats not suport negative or even 0?
It's follow-up question to: How to detect non IEEE-754 float, and how to use them?
In theory, can we assume that c float always support negative numbers?
Solution
Can floats not suport negative or even 0?
I don't think the intention is to allow not supporting negative or zero:
ISO/IEC9899:2017
Characteristics of floating types <float.h>
... The following parameters are used to define the model for each floating-point type:
- s sign (±1)
- b base or radix of exponent representation (an integer > 1)
- e exponent (an integer between a minimum emin and a maximum emax)
- p precision (the number of base-b digits in the significand)
- fk nonnegative integers less than b (the significand digits)
C23 wording adds stronger assertion
ISO/IEC 9899:202x (E)
Floating types shall be able to represent zero (all fk == 0) and all normalized floating-point numbers (f1 > 0 and all possible k digits and e exponents result in values representable in the type
- Simple frame by frame video decoder library
- GCC no longer implements <varargs.h>
- Contents of IO buffer unknown == unsafe?
- Avoiding strcpy overflow destination warning
- Sort program not working, not sure why
- Fast & accurate atan/arctan approximation algorithm
- What's the difference between strtok_r and strtok_s in C?
- How memory address for pointer to arrays is same as an element in 2D array?
- Which is the best way to suppress "unused variable" warning
- How to use ellipsis in c's case statement?
- How can I exclude non-numeric keys? CS50 Caesar Pset2
- Fast ceiling of an integer division in C / C++
- Is there an invalid pthread_t id?
- How to Implement Universal Setter/Getter Functions for Interrupt-Driven Variables in Embedded C?
- How does SIMD (avx) processing work? for example, if I want 10 32 bit floats how do i fit in a 256 bit avx vector?
- FDCAN problems on STM32G4
- How does the call macro enable mutual recursion between functions f and g in this Hanoi Tower implementation?
- Running test on Rocket core CPU - global variable initialized to 0 is unsuccessful, output wrong value instead
- Interacting with C arrays without knowing the size
- Combination of two strings
- carriage return by fgets
- How to use special characters in C?
- Why does 1.0/100.0 == 0.1/10.0 give True?
- Is it correct to compare pointers in C?
- Force free() to return malloc memory back to OS
- How can I print to standard error in C with 'printf'?
- What is the standard behavior of fread in C on Windows?
- How is strtok removing lines it shouldn't have access to?
- Using array as smart point in C
- Assigning string to malloced 2d char array not working as intended