Variable Inverse In C language

[prafiee]

How can I inverse a variable in C language for using in AVR Microcontroller? In other words, consider I have a variable as: a = 0b01011010, I want to inverse this variable and in save it as: b = 0b01011010; that is, msb of variable a now rolles as lsb of variable b and vice versa.
I would be appreciated of your attention.

 

[saeidjabbari]

if you use this sign " ~ " variable inverse.
for example : a = ~0b01011010 is equal to a=0b10100101