If then statement displaying 2 or 3 decimal places

[Guest]

If I input a number that has 2 decimal places I want it to display 2 decimal
places, if I put in 3 decimals I want it to display 3.

$.02 = $.02
$.129 = $.129 (not $.13)
$.120 = $.12

That make sense?

 

[Fred Smith]

Format your cell as General.

 

[David Biddulph]

Custom format:
"$ "General