Flipping between states

Projects Programming
1

I am looking to change between states in a loop. i.e. every second time I go through the loop, I want to do a different test.

e.g. If State was true, change to false. And if If State was false, change to true.

I tried something like below but it obviously doesn't work because it is changing back to true before the task is being completed.

if (Test_State==true) {
    Test_State==false;
 }

 if (Test_State==false) {
    Test_State==true;
 }

Any ideas?
Thanks.

2

This is wrong anyway:

if (Test_State==true) {
    Test_State==false;
 }

You mean:

if (Test_State==true) {
    Test_State = false;
 }

However the simplest is to "negate" the state. eg.

void loop ()
  {

  // do whatever


  // flip the state
  Test_State = !Test_State;
  }
3

Thank you for both comments! The "!" is exactly what I was looking for!

4 
if ( Test_State == true ) 
{
    Test_State = false;
}

if ( Test_State == false ) 
{
    Test_State = true;
}

So do you walk through your code line by line?
What happens if you start with Test_State as true?
What happens if you start with Test_State as false?

First line - if ( Test_State == true )
then what happens?
What value does Test_State have?

And when it gets to - if ( Test_State == false )
what happens?

You might want to have a read about else that goes with if:
http://arduino.cc/en/Reference/Else