[SOLVED]Help setting up money system

[shango46]

I am trying to make a clicker game where one button makes the item and then one button sells the item. My problem is that I don't know how to make the one button stop selling when it reaches 0 items to sell. My code for the selling of the item as of right now looks like this in game maker:

///Sell items
global.money+=global.PC
global.items-=global.PC

It works to subtract per click, but once it reaches 0, it keeps going in to negatives. I am very new to this so forgive my asking probably simple questions.

 

[FrostyCat]

Use an if block.

if (global.items >= global.PC) {
  global.money += global.PC;
  global.items -= global.PC;
}

 

[shango46]

I figured it out. The best way I found is:

//Sell items

global.money+=global.PC * (global.items > 0)

global.items-=global.PC * (global.items > 0)