#6 Data types in Java

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In this lecture we are discussing
1) datatypes for given variable
a)Types of data-types?
b)primitive data types
c)why do we need different type of integer type?
d)how to create variable of different data types?
2) range and way to declare different data variable
#1
a) Datatypes are categories into primitive and non-primitive datatype.
But in this lecture, we are take all concept upon primitive data type.
b) There are 8 primitive datatype
integer ---byte, short, int, long
float --- float , double
character ---char
boolean --- boolean
c) why do we need different type of integer ?
= there are range for each type. for int --4 bytes ,long --8 bytes, short --2bytes byte --1byte
d) How to create variable of different data type?
= int a=10; byte b=4
= dataType variableName = value;
integer variable declaration
int a=5;
long b=600l; // e.g 578l, 100000l represent long integer type
byte c=127;
short s=128;
float vs double
=double have more precision than float by default java support double.
=declare variable of float and double type
--double a=5.6;
--but float b=5.6; //give error
--correct way float b=5.6f;
character representation
= char ch='a'; //using single quotes on character we can declare char type of variable
boolean representation of variable
= boolean result=true; there are only two value of boolean either true or false.
=In other language like c and c++ -- 0 is treated as false and non zero number treated as true but it is not in java.
{byte, short, int, long, float, double, char, Boolean }
since java is statically type or say strongly type language therefore we need
to mention datatype for each variable for declaring variable.
e.g int i=5; float f=2.5f;
In java integer are by default for integer int type;
for real number by default double
#2
Range and way to declare different data type variable
int i=5;// 4 bytes ---32 bytes -- -2147483648 to 2147483647
short s=5;//2 bytes -- 16 bytes -- -32768 to 32767
byte b=5;//1 byte -- 8 bytes -- -128 to 127
long l=5;//8 bytes -- 64 bytes -- -9223372036854775808 to 9223372036854775807
float f=5.5f;//4 bytes -- 32 bytes -- 1.4e-45 to 3.4028235e+38
double d=5.5;//8 bytes -- 64 bytes -- 4.9e-324 to 1.7976931348623157e+308
char c='a';//2 bytes -- 16 bytes -- 0 to 65535
boolean check=true; //value is either true or false
ASCII - American Standard Code for Information Interchange
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