Java Data Types & Variables

	1. A _________ is a basic unit of storage in Java.
	A.	Identifier
	B.	Variable
	C.	Constant
	D.	Memory

2	. What is the default data type of a decimal number in Java?
	A.	int
	B.	float
	C.	double
	D.	long

	3. What would be the output of the following program? class PrintDefaultValues {     public static void main(String[] args)     {         byte b;         short s;         int i;         long l;         float f;         double d;         boolean bl;         char c;         System.out.println("byte="+b+" short="+s+" int="+i);         System.out.println("long="+l+" float="+f+" double="+d);         System.out.println("char="+c+"boolean="+bl);     } }
	A.	byte=0 short=0 int=0 long=0 float=0.0 double=0.0 char= boolean=false
	B.	byte=0 short=0 int=0 long=0 float=0.000000 double=0.000000 char= boolean=false
	C.	Compilation Error
	D.	None of the Above

4. What would be the output of the following program? class PrintDefaultValues {     /*Global Variables*/     byte b;     short s;     int i;     long l;     float f;     double d;     boolean bl;     char c;     public static void main(String[] args)     {         System.out.println("byte="+b+" short="+s+" int="+i);         System.out.println("long="+l+" float="+f+" double="+d);         System.out.println("char="+c+"boolean="+bl);     } }
	A.	byte=0 short=0 int=0 long=0 float=0.0 double=0.0 char= boolean=false
	B.	byte=0 short=0 int=0 long=0 float=0.000000 double=0.000000 char= boolean=false
	C.	Compilation Error
	D.	None of the Above

5. What would be the output of the following program? class PrintDefaultValues {     static byte b;     static short s;     static int i;     static long l;     static float f;     static double d;     static char c;     static boolean bl;     public static void main(String[] args)     {         System.out.println("byte="+b+" short="+s+" int="+i);         System.out.println("long="+l+" float="+f+" double="+d);         System.out.println("char="+c+"boolean="+bl);     } }
	A.	byte=0 short=0 int=0 long=0 float=0.0 double=0.0 char= boolean=false
	B.	byte=0 short=0 int=0 long=0 float=0.000000 double=0.000000 char= boolean=false
	C.	byte=0 short=0 int=0 long=0 float=0 double=0 char=null boolean=false
	D.	Compilation Error

	6. What would be the output of the following program? class A {     public static void main(String[] args)     {         System.out.println("Hello World!");         int i=0;         if (i=0)         {             System.out.println("i="+i);         }     } }
	A.	Hello World!  i=0
	B.	Hello World!
	C.	Compilation Error
	D.	None of the Above

7. What would be the output of the following program? class multipleAssignment {     public static void main(String[] args)     {         int i,j,k;         i=j=k=10;         System.out.println("i="+i+" j="+j+" k="+k);     } }
	A.	i=10 j=10 k=10
	B.	Compilation Error
	C.	i=0 j=0 k=10

8. What would be the output of the following program? class Sample {     public static void main(String[] args)     {         int i;         System.out.println("i is not used in this program!");     } }
	A.	i is not used in this program!
	B.	Compilation Error

9. How can we create an unsigned int variable in Java?
	A.	Can not be created
	B.	unsigned int i;
	C.	int i=(unsigned int) 10;
	D.	int unsigned i;

10. What would be the output of the following program? class ByteSize {     public static void main(String[] args)     {         byte b=128;         System.out.println(b);     } }
	A.	128
	B.	-128
	C.	Compilation Error
	D.	None of the Above

11. What would be the output of the following program? class ByteSize {     public static void main(String[] args)     {         byte b=127;         System.out.println(b+1);     } }
	A.	128
	B.	-127
	C.	Compilation Error
	D.	None of the Above

12. What is the width and range of int in java?
	A.	32 bits | -2,147,483,648 to 2,147,483,647
	B.	32 bits | 0 to 4294967296
	C.	16 bits | -32768 to 32767
	D.	Compiler Dependent

13. What would be the output of the following program?

class CharRange {     public static void main(String[] args)     {         char ch=88;         System.out.println(ch+" = " +(int)ch);         ch=ch+1;         System.out.println(ch+" = " +(int)ch);     } }

14. What would be the output of the following program? class OctalPrgm {     public static void main(String[] args)     {         int i=08;         System.out.println(i+1);     } }
	A.	9
	B.	09
	C.	00
	D.	Compilation Error

15. What would be the output of the following program?

class OctalPrgm {     public static void main(String[] args)     {         int i=07;         System.out.println(++i);         i=i+1;         System.out.println(++i);     } }
16. What would be the output of the following program? class HexPrgm {     public static void main(String[] args)     {         int i=0x10;         System.out.println(i);     } }
	A.		10
	B.		a
	C.		16

17. What would be the output of the following program? class HexPrgm {     public static void main(String[] args)     {         int i=0xF;         System.out.println(++i);     } }
	A.	0
	B.	16
	C.	17
	D.	Compilation Error

18. What would be the output of the following program?

class Scope1 {     public static void main(String args[])     {         int i=10;         System.out.println(i);         if (i==10)         {             int i=20;             System.out.println(i);         }         System.out.println(i);     } }

19. What would be the output of the following program? class Scope2 {     public static void main(String args[])     {         int i=10;         System.out.println("i="+i);         if (i==10)         {             int j=20;             i=20;             System.out.println("i="+i+" , j="+ j);         }         System.out.println("i="+i+" , j="+ j);     } }
	A.	i=10 i=20, j=20
	B.	i=10 i=10,j=20
	C.	Compilation Error
	D.	None of the Above

20. What would be the output of the following program? class Scope3 {     public static void main(String args[])     {         for (int i=1;i<=3 ;i++ )         {             int y=1;             System.out.println("i="+i+" y="+y);             y++;         }     } }
	A.	i=1 y=1 i=2 y=2 i=3 y=3
	B.	i=1 y=1 i=2 y=1 i=3 y=1
	C.	i=1 y=1 i=1 y=1 i=1 y=1
	D.	Compilation Error