250+ TOP MCQs on Java.lang – Rounding Functions and Answers [2024]

Java MCQs on rounding functions in Java Programming Language.

1. Which of these class provides various types of rounding functions?
a) Math
b) Process
c) System
d) Object

Answer: a
Clarification: None.

2. Which of these methods return a smallest whole number greater than or equal to variable X?
a) double ceil(double X)
b) double floor(double X)
c) double max(double X)
d) double min(double X)

Answer: a
Clarification: ceil(double X) returns the smallest whole number greater than or equal to variable X.

3. Which of these method returns a largest whole number less than or equal to variable X?
a) double ceil(double X)
b) double floor(double X)
c) double max(double X)
d) double min(double X)

Answer: b
Clarification: double floor(double X) returns a largest whole number less than or equal to variable X.

4. Which of function return absolute value of a variable?
a) abs()
b) absolute()
c) absolutevariable()
d) none of the mentioned

Answer: a
Clarification: abs() returns the absolute value of a variable.

5. What will be the output of the following Java code?

```
    class A 
```
```
    {
```
```
         int x;
```
```
         int y;
```
```
         void display() 
```
```
         {
```

              System.out.print(x + " " + y);

```
         }
```
```
    }
```
```
    class Output 
```
```
    {
```

         public static void main(String args[])

```
         {
```
```
             A obj1 = new A();
```
```
             A obj2 = new A();
```
```
             obj1.x = 1;
```
```
             obj1.y = 2;
```
```
             obj2 = obj1.clone();
```
```
             obj1.display();
```
```
             obj2.display();
```
```
         }
```
```
    }
```

a) 1 2 0 0
b) 1 2 1 2
c) 0 0 0 0
d) System Dependent

Answer: b
Clarification: clone() method of object class is used to generate duplicate copy of the object on which it is called. Copy of obj1 is generated and stored in obj2.
Output:

$ javac Output.java
$ java Output
1 2 1 2

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

```
    class Output 
```
```
    {
```

         public static void main(String args[])

```
         {
```
```
             double x = 3.14;  
```
```
             int y = (int) Math.abs(x);
```
```
             System.out.print(y);
```
```
         }
```
```
    }
```

a) 0
b) 3
c) 3.0
d) 3.1

Answer: b
Clarification: None.
Output:

$ javac Output.java
$ java Output
3

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

```
    class Output 
```
```
    {
```

         public static void main(String args[])

```
         {
```
```
             double x = 3.14;  
```

             int y = (int) Math.ceil(x);

```
             System.out.print(y);
```
```
         }
```
```
    }
```

a) 0
b) 3
c) 3.0
d) 4

Answer: d
Clarification: ciel(double X) returns the smallest whole number greater than or equal to variable x.
Output:

$ javac Output.java
$ java Output
4

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

```
    class Output 
```
```
    {
```

         public static void main(String args[])

```
         {
```
```
             double x = 3.14;  
```

             int y = (int) Math.floor(x);

```
             System.out.print(y);
```
```
         }
```
```
    }
```

a) 0
b) 3
c) 3.0
d) 4

Answer: b
Clarification: double floor(double X) returns a largest whole number less than or equal to variable X. Here the smallest whole number less than 3.14 is 3.
Output:

$ javac Output.java
$ java Output
3

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