250+ TOP MCQs on Character and Boolean Data Types and Answers [2024]

Java MCQs on Character and Boolean Datatypes of Java Programming Language.

1. What is the numerical range of a char data type in Java?
a) -128 to 127
b) 0 to 256
c) 0 to 32767
d) 0 to 65535

Answer: d
Clarification: Char occupies 16-bit in memory, so it supports 2¹⁶ i:e from 0 to 65535.

2. Which of these coding types is used for data type characters in Java?
a) ASCII
b) ISO-LATIN-1
c) UNICODE
d) None of the mentioned

Answer: c
Clarification: Unicode defines fully international character set that can represent all the characters found in all human languages. Its range is from 0 to 65536.

3. Which of these values can a boolean variable contain?
a) True & False
b) 0 & 1
c) Any integer value
d) true

Answer: a
Clarification: Boolean variable can contain only one of two possible values, true and false.

4. Which of these occupy first 0 to 127 in Unicode character set used for characters in Java?
a) ASCII
b) ISO-LATIN-1
c) None of the mentioned
d) ASCII and ISO-LATIN1

Answer: d
Clarification: First 0 to 127 character set in Unicode are same as those of ISO-LATIN-1 and ASCII.

5. Which one is a valid declaration of a boolean?
a) boolean b1 = 1;
b) boolean b2 = ‘false’;
c) boolean b3 = false;
d) boolean b4 = ‘true’

Answer: c
Clarification: Boolean can only be assigned true or false literals.

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

```
    class array_output {
```

        public static void main(String args[])

```
        {    
```

            char array_variable [] = new char[10];

```
	    for (int i = 0; i < 10; ++i) {
```

                array_variable[i] = 'i';

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

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

a) i i i i i
b) 0 1 2 3 4
c) i j k l m
d) None of the mentioned

Answer: a
Clarification: None.
output:

$ javac array_output.java
$ java array_output
i i i i i

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

```
    class mainclass {
```

        public static void main(String args[])

```
        {
```
```
            char a = 'A';
```
```
            a++;
```
```
	    System.out.print((int)a);
```
```
        } 
```
```
    }
```

a) 66
b) 67
c) 65
d) 64

Answer: a
Clarification: ASCII value of ‘A’ is 65, on using ++ operator character value increments by one.
output:

$ javac mainclass.java
$ java mainclass
66

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

```
    class mainclass {
```

        public static void main(String args[])

```
        {
```
```
            boolean var1 = true;
```
```
	    boolean var2 = false;
```
```
	    if (var1)
```
```
	        System.out.println(var1);
```
```
	    else
```
```
	        System.out.println(var2);
```
```
       } 
```
```
    }
```

a) 0
b) 1
c) true
d) false

Answer: c
Clarification: None.
output:

$ javac mainclass.java
$ java mainclass
true

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

```
    class booloperators {
```

        public static void main(String args[])

```
        {
```
```
            boolean var1 = true;
```
```
	    boolean var2 = false;
```
```
	    System.out.println((var1 & var2));
```
```
        } 
```
```
    }
```

a) 0
b) 1
c) true
d) false

Answer: d
Clarification: boolean ‘&’ operator always returns true or false. var1 is defined true and var2 is defined false hence their ‘&’ operator result is false.
output:

$ javac booloperators.java
$ java booloperators
false

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

```
    class asciicodes {
```

        public static void main(String args[])

```
        {
```
```
            char var1 = 'A';
```
```
	    char var2 = 'a';
```

	    System.out.println((int)var1 + " " + (int)var2);

```
        } 
```
```
    }
```

a) 162
b) 65 97
c) 67 95
d) 66 98

Answer: b
Clarification: ASCII code for ‘A’ is 65 and for ‘a’ is 97.
output:

$ javac asciicodes.java
$ java asciicodes
65 97

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