Description

Data types specify the different sizes and values that
can be stored in the variable.
It is used for declaring variables or functions of different types.

C/C++

-> C supports both signed and unsigned data type.
-> The memory size of the basic data types may change according to 32 or 64-bit
   operating system.
-> There are following data type in c(32-bit).

Types	Data Types
Basic Data Type	int, char, float, double
Derived Data Type	array, pointer, structure, union, Function type
Enumeration Data Type	enum
Void Data Type	void

-> Below is the list of data types –

Data Type	Memory(Bytes)	Range	Format Specifier
char	1	-128 to 127	%c
signed char	1	-128 to 127	%c
unsigned char	1	0 to 255	%c
short	2	-32,768 to 32,767	%hd
signed short	2	-32,768 to 32,767	%hd
unsigned short	2	0 to 65,535	%hu
int	2	-32,768 to 32,767	%d
signed int	2	-32,768 to 32,767	%d
unsigned int	2	0 to 65,535	%u
short int	2	-32,768 to 32,767	%hd
signed short int	2	-32,768 to 32,767	%u
unsigned short int	2	0 to 65,535	%hu
long int	4	-2,147,483,648 to 2,147,483,647	%ld
signed long int	4	-2,147,483,648 to 2,147,483,647	%ld
unsigned long int	4	0 to 4,294,967,295	%lu
float	4	6 decimal places(Precision)	%f
double	8	15 decimal places(Precision)	%lf
long double	10		%Lf

->  Boolean data type contains two types of values 0 and 1.
	0 represents false value and 1 represents true value.
	To use bool data type add stdbool.h header file.

/* C Program to explain Data Type */
//Save it as DataTypeInC.c

#include<stdio.h>
#include<stdbool.h>
int main(){

    bool booleanDataType=true;
    printf("Boolean : %d\n",booleanDataType);

    char charDataType='H';
    printf("char : %c\n",charDataType);

    int intDataType=100;
    printf("int : %d\n",intDataType);

    float floatDataType=15.85;
    printf("float : %f",floatDataType);

    return 0;
}

Output:
Boolean : 1
char : H
int : 100
float : 15.850000

Java

-> There are two types of data types in java.
	1) Primitive data types: boolean, char, byte, short, int, long, float and double are primitive data types.
	2) Non-primitive data types: Classes, Interfaces, and Arrays are non non-primitive data types.
-> There are following data type in - 

Data Type	Default Value	Default size	Range
boolean	false	1 bit	true,false
char	‘\u0000’	2 byte	0 to 255
byte	0	1 byte	-128 to 127
short	0	2 byte	-32,768 to 32,767
int	0	4 byte	-2,147,483,648 to 2,147,483, 647
long	0L	8 byte	-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
float	0.0f	4 byte	6 to 7 significant decimal digits
double	0.0d	8 byte	15 significant decimal digits

Note: Default value is for instance variable(Variable which are defined inside
			 the class but outside the method).

/* Java Program to explain Data Type */
//Save it as DataTypeInJava.java

import java.io.*;
public class DataTypeInJava {
	
	static boolean booleanDataTypeDefault;
	static boolean booleanDataTypeValue = true;
	
	static char charDataTypeDefault;
	static char charDataTypeValue = 'd';
	
	static byte byteDataTypeDefault;
	static byte byteDataTypeValue = 100;
	
	static short shortDataTypeDefault;
	static short shortDataTypeValue = 1320;
	
	static int intDataTypeDefault;
	static int intDataTypeValue = 150000020;
	
	static long longDataTypeDefault;
	static long longDataTypeValue = 15007800450000L;
	
	static float floatDataTypeDefault;
	static float floatDataTypeValue = 7.87f;
	
	static double doubleDataTypeDefault;
	static double doubleDataTypeValue = 74.800045;
	
	static String stringDataTypeDefault;
	static String stringDataTypeValue = "Assigned Value";
	
	public static void main(String[] args) {
		
		System.out.println("The default value of boolean : " + booleanDataTypeDefault);
		System.out.println("The assigned value of boolean : " + booleanDataTypeValue);
		
		System.out.println();
		
		System.out.println("The default value of char : " + charDataTypeDefault);
		System.out.println("The assigned value of char : " + charDataTypeValue);
		
		System.out.println();
		
		System.out.println("The default value of byte : " + byteDataTypeDefault);
		System.out.println("The assigned value of byte : " + byteDataTypeValue);
		
		System.out.println();
		
		System.out.println("The default value of short : " + shortDataTypeDefault);
		System.out.println("The assigned value of short : " + shortDataTypeValue);
		
		System.out.println();
		
		System.out.println("The default value of int : " + intDataTypeDefault);
		System.out.println("The assigned value of int : " + intDataTypeValue);
		
		System.out.println();
		
		System.out.println("The default value of long : " + longDataTypeDefault);
		System.out.println("The assigned value of long : " + longDataTypeValue);
		
		System.out.println();
		
		System.out.println("The default value of float : " + floatDataTypeDefault);
		System.out.println("The assigned value of float : " + floatDataTypeValue);
		
		System.out.println();
		
		System.out.println("The default value of double : " + doubleDataTypeDefault);
		System.out.println("The assigned value of double : " + doubleDataTypeValue);
		
		System.out.println();
		
		System.out.println("The default value of string : " + stringDataTypeDefault);
		System.out.println("The assigned value of string : " + stringDataTypeValue);
	}
}

Output:
The default value of boolean : false
The assigned value of boolean : true

The default value of char : \u0000
The assigned value of char : d

The default value of byte : 0
The assigned value of byte : 100

The default value of short : 0
The assigned value of short : 1320

The default value of int : 0
The assigned value of int : 150000020

The default value of long : 0
The assigned value of long : 15007800450000

The default value of float : 0.0
The assigned value of float : 7.87

The default value of double : 0.0
The assigned value of double : 74.800045

The default value of string : null
The assigned value of string : Assigned Value

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