Submitted by Preeti Jain, on January 31, 2018 . As discussed earlier, here int n; allocates some space in the memory to the variable 'n'.. n = 4 assigns a value 4 to the variable 'n'.. Difference between float and double in Java 1. Then n = 4 assigns 4 to 'n'. You should use a floating point type whenever you need a number with a decimal, such as 9.99 or 3.14515. Java basic data types are predefined and implicit to the language. 1) float data type in java. 1) float is a data type (or in another words it is a keyword which has special meaning) in java. The float data type can store fractional numbers from 3.4e−038 to 3.4e+038. Thus, if you want to give a character value to 'n', then use char before 'n' (instead of int). The range of values is beyond the scope of this discussion but it is mainly specified in the Floating-Point Types, Formats, and Values section of the Java Language Specification.. Size of float in bytes - Core Java Questions - Floating Point Data Types In Java with Examples: Java Floating Point Data Types are used whenever you need a number with a decimal such as 3.1415. Study and learn Java MCQ questions and answers on Primitive data types like byte, short, char, int, long, float, double and boolean. So, now 'n' is 4. Note that you should end the value with an "f": The double data type is a double-precision 64-bit IEEE 754 floating-point. Float. They are of two types, float and double. Its range of values is beyond the scope of this discussion, but is specified in the Floating-Point Types, Formats, and Values section of the Java Language Specification. Go through Java Basic Theory Notes on Data Types before studying these questions. Below is the java program to print size a float and a double takes. The Wikipedia page on it is a good place to start.. To sum up: float is represented in 32 bits, with 1 sign bit, 8 bits of exponent, and 23 bits of the significand (or what follows from a scientific-notation number: 2.33728*10 12; 33728 is the significand).. double is represented in 64 bits, with 1 sign bit, 11 bits of exponent, and 52 bits of significand. Floating Point Types. Java supports eight basic primitive data types. 2) float takes 4 bytes(i.e. So, int n is declaring that variable 'n' is an int and allocates some space in the memory to 'n'. The float data type is a single-precision 32-bit IEEE 754 floating-point. In the IEEE 754 floating-point number standard for 32 bit words, the largest positive number that can be stored is 1.11111111111111111111111 x 2 127 = 3.40282347 x 10 38.The smallest positive number (in normal form) is 1.00000000000000000000000 x 2-126 = 1.17549435 x 10-38.The smallest positive number (not in normal form) is 0.00000000000000000000001 x 2-126 = 2-23 x 2-126 = 1.40239846 x … Attend job interviews easily with these MCQs. float and double are called floating-point literals. Differences Between Java float vs Double. This tutorial explains basic primitive data types (int, long, short, byte, char, boolean, float, double) with their size, range and default value. Use a float (instead of double) if you need to save memory in large arrays of floating-point numbers. Double-precision floating-point format (sometimes called FP64 or float64) is a computer number format, usually occupying 64 bits in computer memory; it represents a wide dynamic range of numeric values by using a floating radix point.. Memory : float takes 4 bytes (32 bits) where as double takes 8 bytes(64 bits). Both double and float are used to represent floating-point numbers in java, although there are similarities as well as differences between double and float in java. Syntax: float floatVar; Size: 4 byte ( 32 bits ) Values: upto 7 decimal digits Default Value: 0.0 7. double: The double data type is a double-precision 64-bit IEEE 754 floating-point. For float: double can provide precision up to 15 to 16 decimal points whereas float provides precision up to 6 to 7 decimal places. 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