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Introduction to Lua tonumber

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Syntax:

In Lua script we used lot of default methods, keywords and functions for to implement the application as per the requirements. Like that tonumber() is one of the built-in function for to convert the other types to number formats.

type(local) variable = values type var = tonumber(variable) -----some lua script code logics depends upon the user requirement-----

The above codes are the basic syntax for to convert the one type of values to another type like number format using tonumber() method we can converted the values to number or integer formats.

How tonumber function works in Lua?

The tonumber() method is used for to convert the arguments to the number format argument may be any type like strings etc. If suppose the argument or parameters will be already the number or the string formats if the value is string format means it will be converted to the number format using tonumber() method. Or else if the input type is already number type if also use tonumber() method is required on the script means it will return the same number or else it return the nil value. Also the optional arguments or not-required arguments specifies the base value to interpret the numeral characters. Also the string type input values may be supported for either uppercase or lowercase characters if the base value is above 10 the number format is automatically changed to characters that is upper case letter like “A” and 11 is “B” like hexadecimal format. But here A to Z is used and denote with the number like A=10 so forth it continues and randomly assign the numbers to upper case letter like Z=35. But always the base is 10 it’s the default value for the decimal numbers so as well as an optional exponent part but in other bases are supported for only the unsigned integer numbers.

Example #1

Code:

local stringnumber = "10" local a = tonumber(stringnumber) print(a + 10) local a = "10" print(type(a)) local num = tonumber(a) print(type(num)) i = 1 while (i <= 20) do io.write(i) i = i + 1 if i == 13 then break end end print("n Please continue your inputs") repeat io.write("Welcome To My Domain its a first example we have used the tonumber() method for to convert the string or any other types to number formats:") rslt = io.read() until tonumber(rslt) == 17 for i = 1, 20, 3 do io.write(i) end print("Your inputs are validated and continue with our next step process") mnths = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"} for k, v in pairs(mnths) do io.write(v, " Your input values are iterated and its validated using the key, value pair process ") end print("Your first example is over")

Output:

Example #2

local ip = ‘1234.957 welcome please changed your password in your system and everywhere used and to incorrect. Else That way we can forget it to always reminds you, Your password is incorrect and please enter correct password. or Please use forget password option’

Code:

local num = tonumber(ip) print(num) eg1=0 eg2 = io.read() eg3 = io.read() reslt = {} for i=1,tonumber(eg2) do reslt[i]=io.read() end eg4 = {} for i=1,tonumber(eg2)*2+1 do eg4[i]=0 end for i=1,tonumber(eg2) do eg4[tonumber(eg2)+1+tonumber(reslt[i])]=eg4[tonumber(eg2)+1+tonumber(reslt[i])]+1 end eg5 = {} l = 1 for i=1, 3*tonumber(eg2)+1 do eg5[l]=i-tonumber(eg2)-1 l=l+1 end end io.write(l-1,"Your input numbers are iterated") for i=1,l-1 do io.write(tostring(eg5[i])," ") end print("Your second examples are completed and thanks for calculating the string value to numbers") local rt=tonumber(ip) print(rt)

Output:

Example #3

Code:

local vars print("Welcome To the Third example") local result=tonumber(vars) print("Your input is converted to number and please find the outputn",result) function demo(vars1,vars) if vars<vars1 then vars = vars+1 return vars, vars*vars end print("This method is used for to calculate the square of the given numbers while we iterate the values using the below for loop") end for i,num in demo,6,0 do print(i,num) end print("Your third example is over")

Output:

In final example, we used to calculate the square of the numbers. By using the for loop we can iterate the values and squared the numbers. And also in first line we have declare the local type with the variable like vars we have not mentioned any values and also we have declared another variable result by using the tonumber() method we can convert the vars type value to number type that is casting is performed but here we have not assigned any input values so that it returns nil has the output.

Conclusion

The tonumber() method from the Lua script will generally used it on the casting purpose that is whatever the user assigned the input values with another type like string, arrays, etc. It may be converted to the number with the help of tonumber() method. Like that Lua script uses many number of casting methods among that tonumber is one of the frequent method which help for converting the data to number format.