Vikram

• Nov 13th, 2006

 

The volatile keyword is used to define memory mapped I/O device's register (or Hardware registers) variables, which indicates to the compiler

For example:

int i;

&i=0x1234;

i = 0;

delay();

if(i){                      //Here the Compiler removes this code by optimization     

  some statements  // because 'i' is already assigned with 0 so..

}

if you declare 'i' as volatile then compiler doesn't optimize.

seshug22

 Profile Answers by seshug22 

• Jun 9th, 2010

 

Volatile variable is a global variable and cannot be typecast. It can change its value at anypoint of time.