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#define for multiple statements

 
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nazoa



Joined: 09 Feb 2007
Posts: 58

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#define for multiple statements
PostPosted: Fri Feb 09, 2007 7:54 am     Reply with quote

Hello,
I am unsure what the correct way is for defining multiple statements with #define. For example if I want to replace the following lines

output_low(PIN_C0);
output_low(PIN_C1);

with a single command called 'Shift', can I do the following;

#define Shift (output_low(PIN_C0), output_high(PIN_C1))

Then, in my code simply use it by typing 'Shift;'

The compiler does not generate an error but I would like to know if
this is the correct way to go about it.

Thanks.
kender



Joined: 09 Aug 2004
Posts: 768
Location: Silicon Valley

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PostPosted: Fri Feb 09, 2007 8:46 am     Reply with quote

What you are desribing is called a "macro". Here's how you define it

Code:
// empty parentheses are optional, if you are not passing args to your macro
// by convention names of #defines, including macros, are all capitals
// note the semicolons
#define MY_MACRO() printf("hello"); printf("world");


You would call it just as you have described:
Code:
MY_MACRO; // semicolon is optional on this line, because there is a semicolon at the end of the macro itself
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