VBS convert string to floating point

Question

Dim strnumber
strnumber = \"0.3\"

Dim add
add = 0.1

Dim result 
result  = strnumber +  add

MsgBox result

I want to get 0.4 as result, b

Answer 1

You want to add two numbers. So you should use numbers (and not a string (strnumber) and a number (add):

>> n1 = 0.3
>> n2 = 0.1
>> r  = n1 + n2
>> WScript.Echo r
>>
0,4

As you can see from the output (0,4), I'm using a locale (German) that uses "," as decimal 'point'. But literals always use ".". So by using the proper data types you can write your scripts in a language/locale independent fashion as long as you don't need to process external string data (from a file or user input). Then you have to modify the input before you feed it to a conversion function like CDbl(). For simple cases that can be done with Replace(inp, badmarker, goodmarker).

P.S. You said you " tried clng(strnumber) and int(strnumber)". You should have tried CDbl(). CLng() tries to get a long integer (cf. CInt()), Int() removes/rounds the fraction from number.