Unsigned to signed conversion in C

by

The conversion of a value to signed int is implementation-defined (as you correctly mentioned because of 6.3.1.3p3) . On some systems for example it can be INT_MAX (saturating conversion).

For gcc the implementation behavior is defined here:

The result of, or the signal raised by, converting an integer to a signed integer type when the value cannot be represented in an object of that type (C90 6.2.1.2, C99 6.3.1.3).

For conversion to a type of width N, the value is reduced modulo 2^N to be within range of the type; no signal is raised.

http://gcc.gnu.org/onlinedocs/gcc/Integers-implementation.html

More Related Contents:

  1. What is the behavior of integer division?
  2. Are prototypes required for all functions in C89, C90 or C99?
  3. Passing a multidimensional variable length array to a function
  4. Tentative definitions in C and linking
  5. Return value range of the main function
  6. func() vs func(void) in C99
  7. Standard alternative to GCC’s ##__VA_ARGS__ trick?
  8. C99 inline function in .c file
  9. GCC with -std=c99 complains about not knowing struct timespec
  10. Does the C preprocessor strip comments or expand macros first? [duplicate]
  11. Does either ANSI C or ISO C specify what -5 % 10 should be?
  12. Does Visual Studio 2017 fully support C99?
  13. What is the official status of C99 support in VS2013?
  14. Is it a good idea to use C99 VLA compared to malloc/free?
  15. Setting std=c99 flag in GCC
  16. Does C99 guarantee that arrays are contiguous?
  17. In C99, is f()+g() undefined or merely unspecified?
  18. Is there a meaningful distinction between freestanding and hosted implementations?
  19. c99 goto past initialization
  20. How to implement memmove in standard C without an intermediate copy?
  21. Anonymous union within struct not in c99?
  22. Is there a GCC keyword to allow structure-reordering?
  23. Which C99 features are available in the MS Visual Studio compiler?
  24. How to use compound literals to `fprintf()` multiple formatted numbers with arbitrary bases?
  25. Printf long long int in C with GCC?
  26. Is there a document describing how Clang handles excess floating-point precision?
  27. Dynamic array allocation on stack in C
  28. Is a compiler allowed to add functions to standard headers?
  29. Declaring an array of negative length
  30. Why are compound literals in C modifiable

Leave a Comment