Can I create a chart

Projects General Guidance
1

Can I create a chart to define a variable

2

depends

You should give far more information what you mean exactly to get meaningful answers.

3

Can I create a chart to define a variable

Since "chart" is not a C or C++ term, no. But, as rob says, explain what you want to do, and there probably is some C or C++ construct that does what you want.

4

I would like to create some cases and then if the condions are applied so then he choose one case and never change it anymore

5

What's that got to do with charts?

Please re-read reply #1