"Adding" a number to an variable

[qrux]

Hello!
I have a problem;

Let's say i have an variable of the number 250. I want to modify this number by adding digits after it. Like, if i press my "1" button i have created, i want the variable to be 2501 (not 251).

If i do variable+1, it will (of course) just become 251, which is not what i want.

Thanks!

[tentus]

You mean like this?

Code: Select all

function love.load()
	x = 0
end
function love.draw()
  love.graphics.print(x, 5, 5) 
end
function love.keyreleased(key)
	if tonumber(key) then
		x = (x * 10) + tonumber(key)
	end
end

[kraftman]

Hello!
I have a problem;

Let's say i have an variable of the number 250. I want to modify this number by adding digits after it. Like, if i press my "1" button i have created, i want the variable to be 2501 (not 251).

If i do variable+1, it will (of course) just become 251, which is not what i want.

Thanks!

if you want to keep it as a number: newnumber = tonumber(oldnumber..1)

[Ensayia]

I suppose you could cast the variable to a string, then add the '1' as a string and cast it back to a number.

Code: Select all

somevar = 250
somevar = tonumber(tostring(somevar).."1")

That's untested, but give it a try, it might work. There's likely a more elegant way of doing this.

[TechnoCat]

I suppose you could cast the variable to a string, then add the '1' as a string and cast it back to a number.

Code: Select all

somevar = 250
somevar = tonumber(tostring(somevar).."1")

That's untested, but give it a try, it might work. There's likely a more elegant way of doing this.

Here is the more elegant way: http://codepad.org/T3PQWp4Y

Code: Select all

test = 12
test = test..3
print(test)
print(test + 1)

EDIT: I guess it is technically a string now, but nothing a tonumber() can't fix if you absolutely need it to be a number.

[Ensayia]

I was not aware you could concat a number on like that. You learn something every day.

[Roland_Yonaba]

I was not aware you could concat a number on like that. You learn something every day.

http://www.lua.org/pil/3.4.html

[qrux]

Got it working. Thank you

[Robin]

I was not aware you could concat a number on like that. You learn something every day.

http://www.lua.org/pil/3.4.html

Ah, automatic coercion. The cause of --- and solution to --- all the world's problems.

[Ensayia]

Lua lets you do quite a few more things with easy shortcuts than any other language. I really feel spoiled by it, it would probably be hard for me to start learning another language. There's no way C, C++, Java, etc would allow you to do something that elegant...