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— The right version below:
a=raw_input("please give you number.")
b=float(a)
c=int(b)
d=c+int((b-c)*2)
print d

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— Why raw input? use python3 please

— Thank you

— Don't use Python2

— I just do not know why i am wrong.

— Sorry.i am a beginner with only py2 book at hand.

— What's wrong? looks like it works... have you checked the line 3? in first example you did:
c = int(b)
in second example
c = int(a)
maybe is that the «error»?

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— You can get loads of material online to learn from

— Yes.i think so too.but why?where is the logic error here,i am confuses.

— You should try checking line 3
I think it should be int (b)

— If you're a beginner, you can use a paper and a pen to follow what the code does and you will see what's happening

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