CSC/ECE 517 Fall 2012/ch1 1w21 aa: Difference between revisions

From Expertiza_Wiki
Jump to navigation Jump to search
Line 15: Line 15:
! Usage
! Usage
|-
|-
|byte
| byte
|signed two's complement integer  
| Signed two's complement integer  
|8 bits
| 8 bits
| -128 to 127  
| -128 to 127  
|This datatype can be used in arrays where there is a space constraint to save memory.
| This datatype can be used in arrays where there is a space constraint to save memory.
|-
|-
|short  
| short  
|signed two's complement integer  
| Signed two's complement integer  
|16 bits
| 16 bits
| -32,768 to 32,767
| -32,768 to 32,767
|This datatype can also be used to save memory in large arrrays.
| This datatype can also be used to save memory in large arrrays.
|-
|-
| int  
| int  
Line 40: Line 40:
|-  
|-  
|float  
|float  
|single-precision IEEE 754 floating point
| Single-precision IEEE 754 floating point
|32 bits
| 32 bits
|32-bit IEEE 754 floating-point numbers.See [[http://java.sun.com/docs/books/jls/third_edition/html/typesValues.html#4.2.3]]
| 32-bit IEEE 754 floating-point numbers.See http://java.sun.com/docs/books/jls/third_edition/html/typesValues.html#4.2.3]
|Use this datatype to save memory in large arrays.
| Use this datatype to save memory in large arrays.
|-
|-
| double  
| double  
| double-precision 64-bit IEEE 754 floating point
| Double-precision 64-bit IEEE 754 floating point
| 64 bits
| 64 bits
| 64-bit IEEE 754 floating-point numbers. See [[http://java.sun.com/docs/books/jls/third_edition/html/typesValues.html#4.2.3]]
| 64-bit IEEE 754 floating-point numbers. See [http://java.sun.com/docs/books/jls/third_edition/html/typesValues.html#4.2.3]
|This data type is generally the default for decimal values.
| This data type is generally the default for decimal values.
|-  
|-  
| boolean  
| boolean  
Line 61: Line 61:
| 16 bit
| 16 bit
| Unicode character \u0000(0) through unicode character \uffff(65,535)
| Unicode character \u0000(0) through unicode character \uffff(65,535)
| This type is used to define single characters.
|}
|}



Revision as of 20:42, 9 September 2012

Primitive Objects

Introduction

A primitive data type is a basic or in-built type that a programming language provides for its users. These data types can be used for building other complex and composite data types [1]. In most languages, primitive types usually consist of basic value types for representing the data to be stored. As these data types are built-in, the compilers for these languages usually provide inbuilt support for these data types and so would support most basic operations. In dynamically typed languages like Ruby, these are represented as objects and are referred to as primitive objects. This article discusses the various primitive data types/objects that are present in various objected oriented programming languages and their benefits.

Primitive data types in C++

Primitive data types in Java

There is a certain group of data types that is used very frequently by the programmer. These types are included in the Java language as the primitive data types.These data types have a fixed size which does not change from one system to another and adds to the portability feature of java. There are 8 primitive data types defined in java which are as follows:[2]

Name Description Size(in bits) Range Usage
byte Signed two's complement integer 8 bits -128 to 127 This datatype can be used in arrays where there is a space constraint to save memory.
short Signed two's complement integer 16 bits -32,768 to 32,767 This datatype can also be used to save memory in large arrrays.
int signed two's complement integer 32 bits -2,147,483,648 to 2,147,483,647 This datatype is generally the default datatype for all the numbers we use in our program.
long signed two's complement integer 64 bits -9,223,372,036,854,775,808 to 9,223,373,036,854,775,807 This type is used when we require a value that is outside the range of values provided by int.
float Single-precision IEEE 754 floating point 32 bits 32-bit IEEE 754 floating-point numbers.See http://java.sun.com/docs/books/jls/third_edition/html/typesValues.html#4.2.3] Use this datatype to save memory in large arrays.
double Double-precision 64-bit IEEE 754 floating point 64 bits 64-bit IEEE 754 floating-point numbers. See [3] This data type is generally the default for decimal values.
boolean Boolean 1- bit false, true Use this data type for flags that track a true or false condition.
char a char is a single 16-bit character encoded using Unicode 16 bit Unicode character \u0000(0) through unicode character \uffff(65,535) This type is used to define single characters.

Primitive data types in C#

Primitive data types/objects in Ruby

Advantages and Disadvantages

Conclusion