Ascii to number/decimal

2012 9 25
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Hi, ive read in a number into a file using regexp to find numbers from a string of data
so far i have a variable: s=2.50000
now if i try to manipulate this number for example s*2 i get the following answer:
"ans = 100 92 106 96 96 96 96 96"
im aware that this is ASCII format for the number but i cant work out how to change variable S into a normal number i can manipulate

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