Dear all, now I'm study mathematica, and face a problem like this:

I want to covert string "1107.302" to a double number and then do some calculation.

But the ToExpression function lost the number "02", then what can I do? Any suggestions?Code:`a = "1107.302 ";`

Print[a]; >> Output is 1107.302

b=ToExpression[a];

Print[b]; >> Output is 1107.3

c = b * 2;

.......

Thanks in advance!