Working with Float data in TOML

TOML has good support to represent real numbers.

 

floatDemo.toml

a = 1.23
b = 0.0
c = -0.0
d = -1.234

 

TOML support exponential notation

You can write the float numbers in exponential notation also.

 

floatDemo2.toml

 

a = 123e-2
b = 12.3e-1

c = 123e2
d = 12.3e3

 

Above snippet is equivalent to following json.

{
  "a": 1.23,
  "b": 1.23,
  "c": 12300,
  "d": 12300
}

 

Use _ to enhance readability

You can use _ to enhance the readability of a number.

pi = 3.14_15

 

Special values like Inifinity and NaN are supported

Special float values are always expressed in lower case.

 

specialFloatValues.toml

 

# infinity
a = inf  # positive infinity
b = +inf # positive infinity
c = -inf # negative infinity

# not a number
d = nan  # encoding is implementation-specific
e = +nan # same as `nan`
f = -nan # actual encoding is implementation-specific

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