allowing the ide to calculate

Please help me how could i insert an input number to be used in a formula to get the result without me myself calculating it each time . how can I do so .

Hi,
Welcome to the forum.

Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html

You can program the formula into the controller if it does not rely on super accuracy, but you cannot just write a formula in the IDE and make it work.

You need a controller to do the work.

Use the serial monitor on the IDE to input and output your data.

Tom.. :slight_smile:

Can you give us an example of what you're trying to do? The Arduino can do math at runtime, and the IDE (compiler) pre-processor can do some math too.

You'll need to write an expression with the "answer" on the left like this:

X = 1 + 2;

Or,
X = Y +3; // Where Y has already been defined.

And, you can do things that don't make sense in "regular math" like:
X = X + 1;