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floating-point-data-type.md

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FLOATING POINT DATA TYPE

Floating point data type consists of 2 types:

  • float
  • double
  1. FLOAT:
  • Float data type allows a variable to store decimal values.
  • Storage size of float data type is 4. This also varies depend upon the processor in the CPU as int data type.
  • We can use up-to 6 digits after decimal using float data type.
  • For example, 10.456789 can be stored in a variable using float data type.
  1. DOUBLE:
  • Double data type is also same as float data type which allows up-to 10 digits after decimal.
  • The range for double datatype is from 1E–37 to 1E+37.
float       //minimum range: +/- 1E-37..1E+37  minimum precision: 6 digits
double      //minimum range: +/- 1E-37..1E+37  minimum precision: 10 digits
long double //minimum range: +/- 1E-37..1E+37  minimum precision: 10 digits

With several compilers double and long double are equivalent. That combined with the fact that most standard mathematical functions work with type double, is a good reason to always use the type double if you have to work with fractional numbers.