Answers to Questions and Exercises: Expressions, Statements, and Blocks - Java Tutorial 5.0 英文版

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Answers to Questions and Exercises: Expressions, Statements, and Blocks

Questions

1. Question: What are the data types of the following expressions, assuming that i's type is int?

   i > 0
   i = 0
   i++
   (float)i
   i == 0
   "aString" + i
   

   Answer:

   i > 0            [boolean]
   i = 0            [int]
   i++              [int]
   (float)i         [float]
   i == 0           [boolean]
   "aString" + i    [String]
   

2. Consider the following expression:

   i--%5>0
   

   1. Question: What is the result of the expression, assuming that the value of i is initially 10?
      Answer: false.
   2. Question: Modify the expression so that it has the same result but is easier for programmers to read.
      Answer: (i-- % 5) > 0

Exercises

1. Exercise: Write a program to confirm your answers to Questions 2a and 2b.
   Solution: OperatorEx

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