Multi line macros -- coding convetion

Hello All,

I read some where on macros belwo line.

"All multi-statement macros shall be surrounded by a

Code:

---

do {} while(0)

---

loop. Failure to do this may cause problems when the macro is expanded."

I could not able to get what is failure we can expect when macro gets expanded..?

Any idea on this ..?


Thanks
Rama Kanth

Imagine if you used your macro in the body of an if statement and did not use braces to delimit the if statement's body.