[Solved] What’s different between a single precision and double precision floating values? [duplicate]

Question

In C, double has at least as much precision as, and usually more than, float, and has at least the exponent range of, and usually more than, float.

The C standard only requires that double be able to represent all the values of float: “The set of values of the type float is a subset of the set of values of the type double…” (C 3028 6.2.5 10).

In typical common implementations today, float is represented with 32 bits in the IEEE-754 binary32 format, and double is represented with 64 bits in the binary64 format.

Accepted Answer

In C, double has at least as much precision as, and usually more than, float, and has at least the exponent range of, and usually more than, float.

The C standard only requires that double be able to represent all the values of float: “The set of values of the type float is a subset of the set of values of the type double…” (C 3028 6.2.5 10).

In typical common implementations today, float is represented with 32 bits in the IEEE-754 binary32 format, and double is represented with 64 bits in the binary64 format.