tonumber?

[IIYAMA]

What can you do with tonumber? Because I have never needed it before.

[tosfera]

What can you do with tonumber? Because I have never needed it before.

Think about this;

I'm and vehicle and my fuel is placed into userdata, wich is a string.

You want to use the ammount of fuel that has been used in that day, well use tonumber to do so.

[IIYAMA]

Source: http://www.lua.org

tonumber (e [, base])

Tries to convert its argument to a number. If the argument is already a number or a string convertible to a number, then tonumber returns this number; otherwise, it returns nil.

Give me a sample, because I have never put something in to a "string" I think.

[tosfera]

to can use tostring for money, like;

local loan = givePlayerMoney(hitPlayer, money) -- money = an int 
triggerClientEvent(source, "errorMsg", root, "Well done! I'll give you: $".. tostring(money)) -- now its a string 

tonumber (source: wiki)

function displayVehicleLoss(loss) 
    local thePlayer = getVehicleOccupant(source) 
    if(thePlayer) then -- Check there is a player in the vehicle 
        outputChatBox("Your vehicle just lost " .. tonumber(loss) .. " health.", thePlayer) -- Display the message 
    end 
end 
  
addEventHandler("onVehicleDamage", getRootElement(), displayVehicleLoss) 

[K4stic]

tonumber 

Tries to convert its argument to a number. If the argument is already a number or a string convertible to a number, then tonumber returns this number; otherwise, it returns nil

example:

local currentiron = tonumber ( getElementData ( source, "iron" ) ) or 0 

[IIYAMA]

ok, skipper nice sample

@tosfera

  
    local loan = givePlayerMoney(hitPlayer, money) -- money = an int 
    triggerClientEvent(source, "errorMsg", root, "Well done! I'll give you: $".. tostring(money)) -- now its a string 

But why should it need to be a string?

A word or letter can already be a number.

tonumber(loss) -- loss is already a number.

[csiguusz]

Of course it's not needed if something is already a number, just in case you want to convert a string to a number for some reason.

[IIYAMA]

ok,

But why make a string?

[novo]

You can use tonumber to check if a value is numeric:

  
local value = "text" 
if tonumber(value) then 
outputChatBox("Numeric") 
else 
outputChatBox("Not numeric") 
end 
  

[csiguusz]

I don't understand. Do you askin why to store a number as string? Yes, that really has no sense. But for a command handler function it can be useful to make numbers from the strings that the player inputted.

[DNL291]

You can use tonumber to check if a value is numeric:

  
local value = "text" 
if tonumber(value) then 
outputChatBox("Numeric") 
else 
outputChatBox("Not numeric") 
end 
  

In this case, you should use 'type' in condition.

local value = "text" 
if type(value) == "number" then 
outputChatBox("Numeric") 
else 
outputChatBox("Not numeric") 
end 

[Jaysds1]

Basically, tostring adds quotes to a variable, example:

local var=1370 
outputChatBox(tostring(var)) 

Same with tonumber, but it does the opposite, by removing the quotes, example:

local var = "Hey" 
outputChatBox(type(tonumber(var))) --outputs the type of var after it's quotes is stripped, var should be "variable" 
  

Edited February 20, 2013 by Guest

[Anderl]

Basically, tostring adds quotes to a variable, example:

local var=hey 
outputChatBox(tostring(var)) 

Same with tonumber, but it does the opposite, by removing the quotes, example:

local var = "Hey" 
outputChatBox(type(tonumber(var))) --outputs the type of var after it's quotes is stripped, var should be "variable" 
  

1st example will not work, 'hey' is nowhere declared.