Java Quiz 4 : Literals, Variables & Type Conversions

Welcome to your Java Quiz 4 : Literals, Variables & Type Conversions

1. Which of these is long data type literal?

a) 0x99fffL

b) ABCDEFG

c) 0x99fffa

d) 99671246

2. Which of these can be returned by the operator ?

a) Integer

b) Boolean

c) Character

d) Integer or Boolean

3. Literals in java must be appended by which of these?

a) L

b) l

c) D

d) L and I

4. Literal can be of which of these data types?

a) integer

b) float

c) boolean

d) all of the mentioned

5. Which of these can not be used for a variable name in Java?

a) identifier

b) keyword

c) identifier & keyword

d) none of the mentioned

6. What will be the output of the following Java program?

```
 class evaluate 
```
```
 {
```

 public static void main(String args[])

```
 {
```
```
 int a[] = {1,2,3,4,5};
```
```
 int d[] = a;
```
```
 int sum = 0;
```
```
 for (int j = 0; j < 3; ++j)
```

 sum += (a[j] * d[j + 1]) + (a[j + 1] * d[j]);

```
 System.out.println(sum);
```
```
 } 
```
```
 }
```

a) 38

b) 39

c) 40

d) 41

7. What will be the output of the following Java program?

```
 class array_output 
```
```
 {
```

 public static void main(String args[])

```
 {
```
```
 int array_variable [] = new int[10];
```
```
 for (int i = 0; i < 10; ++i) {
```
```
 array_variable[i] = i/2;
```
```
 array_variable[i]++;
```

 System.out.print(array_variable[i] + " ");

```
 i++;
```
```
 }
```
```
 
```
```
 } 
```
```
 }
```

a) 0 2 4 6 8

b) 1 2 3 4 5

c) 0 1 2 3 4 5 6 7 8 9

d) 1 2 3 4 5 6 7 8 9 10

8. What will be the output of the following Java program?

```
 class variable_scope 
```
```
 {
```

 public static void main(String args[])

```
 {
```
```
 int x;
```
```
 x = 5;
```
```
 {
```
```
 int y = 6;
```
```
 System.out.print(x + " " + y);
```
```
 }
```
```
 System.out.println(x + " " + y);
```
```
 } 
```
```
 }
```

a) 5 6 5 6

b) 5 6 5

c) Runtime error

d) Compilation error

9. Which of these is an incorrect string literal?

a) “Hello World”

b) “Hello\nWorld”

c) “\”Hello World\””

d) "Hello world"

10. What will be the output of the following Java program?

```
 class dynamic_initialization 
```
```
 {
```

 public static void main(String args[])

```
 {
```
```
 double a, b;
```
```
 a = 3.0;
```
```
 b = 4.0;
```
```
 double c = Math.sqrt(a * a + b * b);
```
```
 System.out.println(c);
```
```
 } 
```
```
 }
```

a) 5.0

b) 25.0

c) 7.0

d) Compilation Error

11. Which of these is necessary condition for automatic type conversion in Java?

a) The destination type is smaller than source type

b) The destination type is larger than source type

c) The destination type can be larger or smaller than source type

d) None of the mentioned

12. What is the prototype of the default constructor of this Java class?

 public class prototype { }

a) prototype( )

b) prototype(void)

c) public prototype(void)

d) public prototype( )

13. What will be the error in the following Java code?

 byte b = 50; b = b * 50;

a) b cannot contain value 100, limited by its range

b) * operator has converted b * 50 into int, which can not be converted to byte without casting

c) b cannot contain value 50

d) No error in this code

14. If an expression contains double, int, float, long, then the whole expression will be promoted into which of these data types?

a) long

b) int

c) double

d) float

15. What is Truncation is Java?

a) Floating-point value assigned to an integer type

b) Integer value assigned to floating type

c) Floating-point value assigned to an Floating type

d) Integer value assigned to floating type

Time is Up!