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Pre-Processor
Examples: #define
a=a+BITS;
BITS 8
//same as
a=a+8;
#define hi(x)
(x<<4)
a=hi(a);
//same as
a=(a<<4);
#define isequal(a,b)
(primary_##a[b]==backup_##a[b])
// usage iseaqual(names,5)
is the same as
// (primary_names[5]==backup_names[5])
#define str(s)
#s
#define part(device)
#include str(device##.h)
// usage part(16F887) is the same as
// #include "16F887.h"
Example
Files:
Also See:
ex_stwt.c , ex_macro.c
#UNDEF, #IFDEF, #IFNDEF
#DEFINEDINC
Syntax:
value = definedinc( variable );
Parameters: variable is the name of the variable, function, or type to be checked.
Returns:
Function:
Availability:
Requires:
A C status for the type of id entered as follows:
0 – not known
1 – typedef or enum
2 – struct or union type
3 – typemod qualifier
4 – defined function
5 – function prototype
6 – compiler built-in function
7 – local variable
8 – global variable
This function checks the type of the variable or function being passed in and returns a specific C
status based on the type.
All devices
None.
Examples:
Example
Files:
Also See:
int x, y = 0;
y = definedinc( x );
None
None
// y will return 7 – x is a local variable
87
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