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Question: how can I make data from String type to Float type!

Question:how can I make data from String type to Float type!

tropic 3 Maple
string float
August 23 2010
1

I get a data of string type from .txt file,but i want to use the data from string type to float tpye in my program,In fact ,i had tried in many methods,convert,sscanf,type etc.but, i coundnt solve this problem until now.if u know,please tell me how can i do.

example:

x:="0.01"⇒x=0.01
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