How do I do that a variable couldn´t go under 0

How do I do that a variable couldn´t go under 0

Thanks a lot

If variable <0 set variable to 0.

but i want to use it to pay or so and if i do it on this way u can buy so much u want

how much you can buy... for zero euros?

if u have zero u can buy so much u want and than it is -100 or so and i want thaz u only can buy something if u have enough money u know?

No, I don't know. Can you rephrase that? I couldn't understand what you're trying to say.

i create a game where u can buy something with the coins from the game and if u have for example 10 coins and buy something for 100 coins u have -90 coins. now i want that u cant buy this if u have not enough money.

Just check if the cost is less than or equal to the amount of money before buying.

ex.

money >= cost

....