Legacy GM Check if object is clicked

[VansiusProductions]

Hi
I want to test if an objects is clicked. When the object is clicked for the first time, it sets a value to variable A, if it's clicked for the second time, it sets a value to variable B. When it's clicked and both A and B have a value, it does nothing. How do I achieve this?

 

[Llama_Code]

Initialize variable A and Variable B to 0.

When you click check the value of A, if it's 0 set it, if it's not 0 then Check the value of B, if it's 0 set it.

 

[VansiusProductions]

Initialize variable A and Variable B to 0.

When you click check the value of A, if it's 0 set it, if it's not 0 then Check the value of B, if it's 0 set it.

Thanks for the reply, i used if else for that but only A is working and B isn't. This is my code:

if (global.mouseTouch = 1 && global.groupHover != "none") {
  if (global.groupHover = 0 && global.groupSelectedA = "none") {
    global.groupSelectedA = global.groupHover
    instance_create(352,62,obj_group_air)
    global.mouseTouch = 0
  }
  else {
    if (global.groupHover = 0 && global.groupSelectedA != "none" && global.groupSelectedB = "none") {
      global.groupSelectedB = global.groupHover
      instance_create(352,222,obj_group_air)
      global.mouseTouch = 0
      exit;
    }
  }
}

How do i check if the player clicked on the object, The only event i have is mouse left pressed which is pretty vague.