Difference between double and float

[garfield1]

Hello,

I was confuse to know when a group chatting is going on around us in the college.The confusion is related to the programming languages and the basic things like data type usage are involved in this specification.I used always this forum to solve my problem.So tell me the difference between between double and float data-type.

Thanks.

[Praetor]

The data-type are very primary and very valuable components of programming.
There are so many data types are used in different programming languages but some of the programming languages don't require any data type definition and all.

You have to just define the variable and assign the value whatever you want to assign.The one of the language named Java script.

If we talk about the data type differences between double and float is some nearest precision difference between both data types and both are capable to assign the point included values.

[Katty]

Difference between double and float

The precision have some matter to differentiate it because both data types are capable to store the floating-point number.

A variable defined as float data type only has 7 digits of precision where as a variable defined as double has 15 digits of precision.So it depends on your program requirements that what you need to use in your program.

According to my opinion,the double data type would always be suitable to use in the program for accuracy purpose.

[kelfro]

Floating-point standard of data-type

As katty said that the capability to store the precision of float data-type.She also mentioned the position on which a float and double data type are capable to store.

When a variable is declared as float and the value is being assigned the it takes the following standard.you can see a rounding of numeric values, such as the following:

[Zecho]

A double data type is basically short for "double float" (but you can't say that). A float is usually 32 bits long and on other hand a double is 64 bits. A long double can be anywhere from 64 (same as double) to 128 bits.

If you desire to control the decimal or precision, then you can fire these control statement-

setprecision ( 2 ) // only 2 decimal , e.g 12.22
setprecision ( 3 ) // 12.333

[Reegan]

There are basically three floating point data-types are used in the C or C++ programming - float, double, and long double.

The type double gives the same precision as a float data type can, and the type long double gives at least as much precision as double. The collection of values of the type float is a subset of the set of values of the type double. the set of values of the type double is a subset of the set of values of the type long double. The value representation of floating-point types is implementation-defined. Integral and floating types are collectively called arithmetic types. Specializations of the standard template std::numeric_limits (18.2) shall specify the maximum and minimum values of each arithmetic type for an implementation.