Passing values to macros by for loop

by

It is normal!
The preprocessor (the “thing” that processes the macros) is run BEFORE the C compiler. So, it is only valid when it produces compilable code.

In your case, if you use the code you show

j=Valve(1)

it will work for that value, since it will produce:

j=stTest.bValve1_Cmd

but it will do the entire loop only with that value.
When you change the parameter “1” with the “i” for actually doing the loop, then it will produce:

j=stTest.bValvei_Cmd

which is invalid.

To do what you want, just use a vector:

typedef struct OperationFlags
{
 int bValve_Cmd[2];
}FLAGS_TypeDef;
#define Valve(x) stTest.bValve_Cmd[x]
//....
for(i=1;i<=2;i++)
{
 j=Valve(1);
 printf("%d",j);
}

More Related Contents:

  1. Should C compilers immediately free "further unused" memories? [closed]
  2. How to pass arguments in __VA_ARGS to a 2d character array? [closed]
  3. What is the difference between ‘asm’, ‘__asm’ and ‘__asm__’?
  4. C macros and use of arguments in parentheses
  5. Macro definition to determine big endian or little endian machine?
  6. Are typedef and #define the same in c?
  7. When was the NULL macro not 0?
  8. What is “:-!!” in C code?
  9. Implement generic swap macro in C [duplicate]
  10. What does “#pragma comment” mean?
  11. Why do I need double layer of indirection for macros?
  12. How to merge two windows vc static library into one
  13. What are C macros useful for?
  14. How big can a malloc be in C?
  15. Macro to count number of arguments
  16. Opposite of C preprocessor “stringification”
  17. How to use kbhit and getch (C programming) [closed]
  18. What are the implications of the linux __user macro?
  19. C Macros to create strings
  20. Macro and function with same name
  21. Incompatible pointer types passing in _Generic macro
  22. Why Ctrl-Z does not trigger EOF?
  23. How to use MSVC intrinsics to get the equivalent of this GCC code?
  24. Equivalents to MSVC’s _countof in other compilers?
  25. What makes a better constant in C, a macro or an enum?
  26. Does __asm{}; return the value of eax?
  27. Inline function v. Macro in C — What’s the Overhead (Memory/Speed)?
  28. Debug Print Macro in C?
  29. Is there any option to switch between C99 and C11 C standards in Visual Studio?
  30. What is ‘:-!!’ in C?

Leave a Comment