INTRODUCTION TO JAVA PROGRAMMING教学（华南理工）TEST3.docVIP

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INTRODUCTION TO JAVA PROGRAMMING教学（华南理工）TEST3.doc

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窗体顶端 1? The less than or equal to comparison operator in Java is __________. A. B. = C. = D. E. != B 2? The equal comparison operator in Java is __________. A. B. != C. == D. ^= C 3? What is 1 + 1 + 1 + 1 + 1 == 5? A. true B. false C. There is no guarantee that 1 + 1 + 1 + 1 + 1 == 5 is true. A 4? What is 1.0 + 1.0 + 1.0 + 1.0 + 1.0 == 5.0? A. true B. false(double 类型不一定相等) C. There is no guarantee that 1.0 + 1.0 + 1.0 + 1.0 + 1.0 == 5.0 is true. C 5? In Java, the word true is ________. A. a Java keyword B. a Boolean literal C. same as value 1 D. same as value 0 B 6? Which of the Boolean expressions below is incorrect? A. (true) (3 = 4) B. !(x 0) (x 0) C. (x 0) || (x 0) D. (x != 0) || (x = 0) E. (-10 x 0) ADE 7? Which of the following is the correct expression that evaluates to true if the number x is between 1 and 100 or the number is negative? A. 1 x 100 x 0 B. ((x 100) (x 1)) || (x 0) C. ((x 100) (x 1)) (x 0) D. (1 x 100) || (x 0) B 8? Suppose x=10 and y=10 what is x after evaluating the expression (y 10) (x++ 10). A. 9 B. 10 C. 11 B 9? Suppose x=10 and y=10 what is x after evaluating the expression (y = 10) || (x-- 10). A. 9 B. 10 C. 11 BExplanation: For the || operator, the right operand is not evaluated, if the left operand is evaluated as true. 10? To check whether a char variable ch is an uppercase letter, you write ___________. A. (ch = A ch = Z) B. (ch = A ch = Z) C. (ch = A || ch = Z) D. (A = ch = Z) B 11? Which of the following code displays the area of a circle if the radius is positive. A. if (radius != 0) System.out.println(radius * radius * 3.14159); B. if (radius = 0) System.out.println(radius * radius * 3.14159); C. if (radius 0) System.out.println(radius * radius * 3.14159); D. if (radius = 0) System.out.println(radius * radius * 3.14159); C 12? Analyze the following code:if (x 100) (x 10)??System.out.println(x is between 10 and 100); A. The statement has compile errors because (x100) (x 10) must be encl