Java Quizs Question & Answers – Integer and Floating Data Types

Q 1. An expression involving byte, int, and literal numbers is promoted to which of these?
A. long
B. int
C. byte
D. float

Show Answer

Answer:-B. int

Explanation

An expression involving bytes, ints, shorts, literal numbers, the entire expression is promoted to int before any calculation is done.

Q 2. Which of these literals can be contained in float data type variable?
A. -1.7e+308
B. -3.4e+038
C. +1.7e+308
D. -3.4e+050

Show Answer

Answer:-B. -3.4e+038

Explanation

Range of float data type is -(3.4e38) To +(3.4e38)

Q 3. Which data type value is returned by all transcendental math functions?
A. double
B. float
C. int
D. long

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Answer:-A. double

Explanation

Only double data type value is returned by all transcendental math functions. Transcendental math functions don’t return int or long. They return double instead of float as double has larger range.

Q 4. What will be the output of the following Java code?

1. class average {
2. public static void main(String args[])
3. {
4. double num[] = {5.5, 10.1, 11, 12.8, 56.9, 2.5};
5. double result;
6. result = 0;
7. for (int i = 0; i < 6; ++i)
8. result = result + num[i];
9. System.out.print(result/6);
10.  
11. }
12. }

A. 16.34
B. 16.566666644
C. 16.46666666666667
D. 16.46666666666666

Show Answer

Answer:-C. 16.46666666666667

Explanation

None. output:$ javac average.java $ java average 16.46666666666667

Q 5. What will be the output of the following Java statement?

1. class output {
2. public static void main(String args[])
3. {
4. double a, b,c;
5. a = 3.0/0;
6. b = 0/4.0;
7. c=0/0.0;
8. System.out.println(a);
9. System.out.println(b);
10. System.out.println(c);
11. }
12. }

A. Infinity
B. 0.0
C. NaN
D. all of the mentioned

Show Answer

Answer:-D. all of the mentioned

Explanation

For floating point literals, we have constant value to represent (10/0.0) infinity either positive or negative and also have NaN (not a number for undefined like 0/0.0), but for the integral type, we don’t have any constant that’s why we get an arithmetic exception.

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

1. class increment {
2. public static void main(String args[])
3. {
4. int g = 3;
5. System.out.print(++g * 8);
6. }
7. }

A. 25
B. 24
C. 32
D. 33

Show Answer

Answer:-C. 32

Explanation

Operator ++ has more preference than *, thus g becomes 4 and when multiplied by 8 gives 32. output:$ javac increment.java $ java increment 32

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

1. class area {
2. public static void main(String args[])
3. {
4. double r, pi, a;
5. r = 9.8;
6. pi = 3.14;
7. a = pi * r * r;
8. System.out.println(a);
9. }
10. }

A. 301.56
B. 301
C. 301.5656
D. 301.56560000

Show Answer

Answer:- C. 301.5656

Explanation

None. output:$ javac area.java $ java area 301.5656

Q 8. What is the range of short data type in Java?
A. -128 to 127
B. -32768 to 32767
C. -2147483648 to 2147483647
D. None of the mentioned

Show Answer

Answer:-B. -32768 to 32767

Explanation

Short occupies 16 bits in memory. Its range is from -32768 to 32767.

Q 9. What is the range of byte data type in Java?
A. -128 to 127
B. -32768 to 32767
C. -2147483648 to 2147483647
D. None of the mentioned

Show Answer

Answer:-A. -128 to 127

Explanation

Byte occupies 8 bits in memory. Its range is from -128 to 127.

Q 10. Which of the following are legal lines of Java code?

1. int w = (int)888.8;

2. byte x = (byte)100L; 3. long y = (byte)100; 4. byte z = (byte)100L;

A. 1 and 2
B. 2 and 3
C. 3 and 4
D. All statements are correct

Show Answer

Answer:-D. All statements are correct

Explanation

Statements (1), (2), (3), and (4) are correct. (1) is correct because when a floating-point number (a double in this case) is cast to an int, it simply loses the digits after the decimal. (2) and (4) are correct because a long can be cast into a byte. If the long is over 127, it loses its most significant (leftmost) bits. (3) actually works, even though a cast is not necessary, because a long can store a byte.