Digital Workshop

Yesterday I had some free time so thought I'd try to learn something else in Opus, ended up creating a MPG (miles per gallon) calculator. It takes in the miles done, litres used and cost per litre then works out the mpg you have got. I'm really into cars (got a Civic Type R ) and have a lot of friends on various places that might find this exe useful. Just having a little problem - the three input boxes are obviously number variables set to 0, is there a way that when I run it, they won't automatically have 0 in (it's a pain having to delete it when inputting your figures).

Other than that I'm quite pleased with it, only been messing with Opus on and off for a few weeks

Hi Darryl

I think I understand what you are trying to achieve, though I'm not 100% sure.

If you place a Pre-Show trigger on the page itself and choose from the programming tab, "variables," then enter the specific variable that you are using for the text input box, and, finally, not choose a specific value, it will leave the variable = "" or nothing. This will reset the variable to nothing each time the page is re-entered for the user to employ the calculator. You can repeat this for each variable. Instead of "0" they will be set to "nothing."

Kind Regards,

Thanks for that, I've just given it a go and it works -- appreciate it

Regards

Darryl I have a question about your equation. If you are using all 3 variables as you stated in your first post wouldn't you come up with a 'cost per mile' answer not a 'miles per gallon'. If you wanted a MPG answer you would not need the cost per liter (Or gallon)

I've got another variable set as a number to 4.54 (that's how many litres there are in a gallon).

Basically, I'd write exactly now how I do it but I'm about to go home from work. I've got it working right and it displays the right mpg

Thanks

Darryl, I think you misunderstand my question. If you are using a variable that has to do with price then your answer will also have something to do with price. Price per mile is what stricks me as what you come up with. If you only wanted miles per gallon (or liter) then the cost variable would not be needed.
Example: If I drive 1000 miles and use 30 gallons the the MPG would be 1000 divided by 30 or 33.33 MPG. Haven't used cost variable anywhere to do this.

Sorry yeah I know what you mean. I've got that variable in there as I am next planning to give the user the "cost per mile" in pence - I've not even started doing that as I'm yet to find out how to work it out myself! At the moment it just outputs the MPG into a variable. I'm going to use this variable to work out cost per mile - I hope that's cleared it up (or have I missed your point again?! - it's been a long day!)