The difference of int8_t, int_least8_t and int_fast8_t?

by

The difference is defined in the sections of the C99 standard that Carl Norum quoted. But it may be useful to have an example.

Suppose you have a C compiler for a 36-bit system, with char = 9 bits, short = 18 bits, int = 36 bits, and long = 72 bits. Then

  • int8_t does not exist, because there is no way to satisfy the constraint of having exactly 8 value bits with no padding.
  • int_least8_t is a typedef of char. NOT of short or int, because the standard requires the smallest type with at least 8 bits.
  • int_fast8_t can be anything. It’s likely to be a typedef of int if the “native” size is considered to be “fast”.

More Related Contents:

  1. to find the total no of letter in a string. please checkout my code too
  2. I am not getting output. When I enter the number of books it crashes.. I don’t know why!!! I am new C
  3. Please tell whats the error… why it’s not compiling?
  4. Why does printf not flush after the call unless a newline is in the format string?
  5. Using LEA on values that aren’t addresses / pointers?
  6. Display an array of color in C [closed]
  7. Atomicity of `write(2)` to a local filesystem
  8. return value of pow() gets rounded down if assigned to an integer
  9. Why can I not modify a string literal in c?
  10. Rand Implementation
  11. What does malloc(0) return? [duplicate]
  12. Difference between signed / unsigned char [duplicate]
  13. What is the meaning of “wild pointer” in C?
  14. Return a 2d array from a function
  15. Does unaligned memory access always cause bus errors?
  16. Pass a two dimensional array to a function of constant parameter
  17. XML Parser for C [closed]
  18. How to execute a shell script from C in Linux?
  19. Explain this implementation of malloc from the K&R book
  20. getopt.h: Compiling Linux C-Code in Windows
  21. Whitespace before %c specification in the format specifier of scanf function in C
  22. How to get the current time in milliseconds from C in Linux?
  23. memory alignment within gcc structs
  24. How can I avoid “duplicate symbol” errors in xcode with shared static libraries?
  25. C: How can I make it so scanf() input has one of two formats?
  26. How to define and work with an array of bits in C?
  27. Terminate a process tree (C for Windows)
  28. Values obtained in case of a recursive function
  29. How to get the size of a C function from inside a C program or with inline assembly?
  30. What’s the difference between “C system calls” and “C library routines”?

Leave a Comment