How to detect if a variable has changed?

Question

I have found myself wanting to do certain things in my programs only if a variable has changed. I have so far been doing something like this:

int x = 1;
in         


        

Answer 1

Example:

create a variable with the same name with a number.

int var1;
int var2;

if(var1 != var2)
{
//do the code here

var2 = var1;
}

hope this help.