Though Float and Double both of them are used for assigning real (or decimal) values in programming there is a major difference between these two data types.

Float Double
This is generally used for graphic based libraries for making the processing power of your programs faster, as it is simpler to manage by compilers. This is the most commonly used data type in programming languages for assigning values having a real or decimal based number within, such as 3.14 for pi.
It has single precision. It has the double precision or you can say two times more precision than float.
According to IEEE, it has a 32-bit floating point precision. According to IEEE, it has a 64-bit floating point precision.
Float takes 4 bytes for storage. Double takes 8 bytes for storage.
A value having a range within 1.2E-38 to 3.4E+38 can be assigned to float variables. A value having range within 2.3E-308 to 1.7E+308 can be assigned to double type variables
Has a precision of 6 decimal places. Has a precision of 15 decimal places.

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