34.11. Chapter Summary

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Review Questions

Sections 4.2 “4.8

4.1	How many times is the following loop body repeated? What is the printout of the loop?
4.2	What are the differences between a while loop and a do-while loop?
4.3	Do the following two loops result in the same value in sum ?
4.4	What are the three parts of a for loop control? Write a for loop that prints the numbers from 1 to 100 .
4.5	What does the following statement do? for ( ; ; ) { do something; }
4.6	If a variable is declared in the for loop control, can it be used after the loop exits?
4.7	Can you convert a for loop to a while loop? List the advantages of using for loops.
4.8	Convert the following for loop statement to a while loop and to a do-while loop: long sum = ; for ( int i = ; i <= 1000 ; i++) sum = sum + i;
4.9	Will the program work if n1 and n2 are replaced by n1 / 2 and n2 / 2 in line 15 in Listing 4.6?

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Section 4.9 Keywords break and continue

4.10	What is the keyword break for? What is the keyword continue for? Will the following program terminate? If so, give the output.
4.11	Can you always convert a while loop into a for loop? Convert the following while loop into a for loop. int i = 1 ; int sum = ; while (sum < 10000 ) { sum = sum + i; i++; }
4.12	The for loop on the left is converted into the while loop on the right. What is wrong? Correct it.
4.13	Rewrite the programs TestBreak and TestContinue in Listings 4.9 and 4.10 without using break and continue .
4.14	After the break outer statement is executed in the following loop, which statement is executed? outer: for ( int i = 1 ; i < 10 ; i++) { inner: for ( int j = 1 ; j < 10 ; j++) { if (i * j > 50 ) break outer; System.out.println(i * j); } } next :
4.15	After the continue outer statement is executed in the following loop, which statement is executed? outer: for ( int i = 1 ; i < 10 ; i++) { [Page 121] inner: for ( int j = 1 ; j < 10 ; j++) { if (i * j > 50 ) continue outer; System.out.println(i * j); } } next:

Comprehensive

4.16	Identify and fix the errors in the following code: 1 public class Test { 2 public void main(String[] args) { 3 for ( int i = ; i < 10 ; i++); 4 sum += i; 5 6 if (i < j); 7 System.out.println(i) 8 else 9 System.out.println(j); 10 11 while (j < 10 ); 12 { 13 j++; 14 }; 15 16 do { 17 j++; 18 } while (j < 10 ) 19 } 20 }
4.17	What is wrong with the following program?
4.18	Show the output of the following programs: [Page 122]
4.19	Reformat the following programs according to the programming style and documentation guidelines proposed in §2.14. Use the next-line brace style.