Floating Point Numbers
A floating-point number is a
Number consisting of an optional sign, one or more digits, a decimal point optionally followed by one or more digits, optionally followed by the letter
e or
E, optionally followed by a sign, followed by one or more digits.
A number without a decimal point is an
Integer.
[sign] digit [digit [ ... ] ] . [ { digit [digit [ ... ] ] } ] [{e | E} [sign ] digit [digit [digit [ ... ] ] ]
- sign : + or -, if the sign is missing, it is presumed to be +.
- digit : 0 through 9.
- . : indicates the number is a floating point number rather than an Integer.
- e or E : indicates the number has an exponent. The case is ignored. There must be at least one digit after the E or e, optionally preceded by a sign.
At least one digit must appear before the decimal point. Note that while no digits are required after the decimal point, at least one digit
must follow an
E or
e if it is used.
 |
If there is no decimal point and no exponant, then the number will be interpreted as an integer.
|
The following are all valid floating-point numbers:
0.0 +0.0 0. -0.0 0.0e+1 0.0e-1 0.e+0 0.0e0 0.0e-0 -0.0e-0 (all are the same 0.0) 0.7 -0.3 1.0 -1. 1. -1.0 37.16 -40.33 +1.5 -12.34 3.14159267 1.39e5 1.7E-3
The following are all the same:
1000000.0 1.E+7 1e7 1.0e7 10.0e6 0.100E8 10000000.0E-1
provides two different floating-point types:
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Floating-Point
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Description
|
Default value
|
Size in memory
|
|---|
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Single
|
-1.7014118E-38 .. +1.7014118E+38
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0.0
|
4 bytes
|
|
Float
|
-8.98846567431105E-307 .. +8.98846567431105E+307
|
0.0
|
8 bytes
|
> cat > float 
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