《Java语言程序设计基础篇》第10版 梁勇 著第五章练习题答案Word文档格式.docx

1、 0） countPositive+; else if （num countNegative+; total += num; count+; / Read the next number if （count = 0） System.out.println（no numbers are entered except 0 else The number of positives is + countPositive）;The number of negatives is + countNegative）;The total is + total）;The average is + total *

2、1.0 / count）;5.1附加 public class Exercise05_01Extra final int NUMBER_OF_TRIALS = 10000000; int numberOfHits = 0; for （int i = 0; i NUMBER_OF_TRIALS; i+） double x = Math.random（） * 2.0 - 1; double y = Math.random（） * 2.0 - 1; if （x * x + y * y = 1） numberOfHits+; double pi = 4.0 * numberOfHits / NUMBE

3、R_OF_TRIALS;PI is + pi）;5.2public class Exercise05_02 int correctCount = 0; / Count the number of correct answers int count = 0; / Count the number of questions java.util.Scanner input = new java.util.Scanner（System.in）; long startTime = System.currentTimeMillis（）; while （count 10） / 1. Generate two

4、 random single-digit integers int number1 = 1 + （int）（Math.random（） * 15）; int number2 = 1 + （int）（Math.random（） * 15）; / 2. Prompt the student to answer 搘hat is number1 ?number2?What is + number1 + + + number2 + int answer = input.nextInt（）; / 3. Grade the answer and display the result String reply

5、String; if （number1 + number2 = answer） replyString = You are correct!; correctCount+;Your answer is wrong.n should be + （number1 + number2）; System.out.println（replyString）; / Increase the countCorrect count is + correctCount）; long endTime = System.currentTimeMillis（）;Time spent is + （endTime - st

6、artTime） / 1000 + seconds5.2附加public class Exercise05_02Extra final int NUMBER_OF_TRIALS = 1000000; i+） if （x 1 | x 1 | y 0） double slope = （1.0 - 0） / （0 - 1.0）; double x1 = x + -y * slope; if （x1 return false; return true; else */5.3 public class Exercise05_03 System.out.printf（%-14s%-10sn, Kilogr

7、amsPounds- int kilograms = 1; while （kilograms 200） %-14d%-10.1fn, kilograms, kilograms * 2.2）; kilograms += 2;/* Alternatively use for loop for （int kilograms = 1; kilograms = 199; kilograms += 2） System.out.println（kilograms + tt + kilograms * 2.2）;*/5.3附加public class Exercise05_03Extra Enter the

8、number of seconds: int numberOfSeconds = input.nextInt（）; long currentTime = System.currentTimeMillis（） / 1000; long endTime = currentTime + numberOfSeconds * 1000; while （currentTime 1000） System.out.println（endTime - currentTime） / 1000 + seconds remaining else if （endTime - currentTime = 1000）1 second remaining currentTime += 1;Stopped5.4public class Exercise05_04 MilesttKilometers- / Use while loop int miles = 1; while （miles = 10） System.out.println（miles + + miles * 1.609）; miles+; for （int miles = 1; miles = 10; miles+） 5.4附加