超星 - Quiz for Chapter 2-3 Numerical Data Types - 查题吧

单选题

What is x after the following statements?int x = 2;int y = 1;x *= y + 1;

A. x is 2.
B. x is 4.
C. x is 1.
D. x is 3.

单选题

Math.pow(4, 1.0 / 2) returns __________.

A.2
B.1.0
C.0
D.2.0

单选题

Which of the following statements are the same? (A) x -= x + 4 (B) x = x + 4 – x (C) x = x - (x + 4)

A.(A), (B), and (C) are the same
B.(B) and (C) are the same
C.(A) and (C) are the same
D.(A) and (B) are the same

单选题

Which of the following assignment statements is incorrect?

A.i = j = k = 1;
B.i = 1; j = 1; k = 1;
C.i = 1 = j = 1 = k = 1;

单选题

You can always assign a value of long type to a variable of int type without loss of precision.

A.true
B.false

单选题

You can always assign a value of int type to a variable of long type without loss of information.

A.true
B.false

单选题

Which of these data types requires the most amount of memory?

A.byte
B.short
C.long
D.int

单选题

If a number is too large to be stored in a variable of the float type, it _____________.

A.cannot happen in Java
B.causes overflow
C.causes underflow
D.causes no error

单选题

Are the following four statements equivalent? number += 1; number = number + 1; number++; ++number;

A.Yes
B.No

单选题

Suppose a Scanner object is created as follows: Scanner input = new Scanner(System.in); What method do you use to read an int value?

A.input.nextInteger();
B.input.nextInt();
C.input.int();
D.input.integer();

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