Problem Call dll function from excel

[Khanh01]

Hi, I am following some instructions for calling dll function from excel, can someone please explain help me why my argument is 120 but while debugging gives very small results?
I am waiting for account verification so I cannot upload photos yet,my image:

https://1.bp.blogspot.com/-U__iw7y5...Oyo9HDvIlbLgCLcBGAsYHQ/s1600/Screenshot_2.png

Here is the function I declared in vba:
Declare PtrSafe Function square Lib "Threefunction.dll" (ByVal x As Double) As Double

I have tried many ways but the results have not changed..
Thanks so much!

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