Suppose there is a variable 

```
int a = 10;

```

when I run the program again and access the data it's the same when I access it somehow. And then I am able to change it, suppose to

```
a = a + 6;

```

And after that, unless until I change it to something else, the value remain the same.

Is there anyway to do something like that?

Note: Don't want to use files, and or external database.