Question

Discussion: Primitive datatypes and built-in data structures Review the following website and discuss the representation and use of primitive data types in either the Java or Clanguages.

please help!! i not understand this talking about but i am try to understand hard. i show you website https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html, thank you!

Answer 1

In programming language, we must aware of data types which tells about the type of data which is going to be stored or operated.

(i) byte:- when we have limited range of values from -128 to 127 then we can use byte data type to store integer values. Internally it uses 8 bit signed 2's complement integer. you know that negative number can be represented by 2's complement way.

for ex- byte value=-24; // internally it looks 11101000. (since 24 in binary= 00011000 now find 2's complement of it).

This data type is useful in using array. since large array may contain many cells. So if we will use int data type it would take 4*number of cells . Suppose int value[1000] then it would take 4000 byte of memory while if we use byte data type it would take 1 byte per cell so total memory =1000 byte only.

(ii) short:- This gives more range values. it has range of -32768 to 32767. It takes 2 bytes of memory. and internally it uses 16 bit signed 2's complement representation. It is used for integer representation.

(iii) int :- This gives more range of values. it consumes 4 byte of memory per cell in array.

(iv) long:- this is also for large range integer representation.

float and double are real point arithmetic values such as 23.455, 877.734873 etc. when we want to store decimal values also then we can use float and double.

boolean data type is used for storing true or false value. e.g boolean value=true;

lastly we have char data type which is used to store characters . e.g storing name . It uses 1 byte of memory .

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