JavaScript/JScript: Control Structures I - Pearson Learning Solutions

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2008934301 Chapter 14 JavaScript/JScript: Control Structures I 441 14.17 Using an approach similar to Exercise 14.15, find the two largest values among the 10 digits entered. (Note: You may input each number only once.) 14.18 Modify the program in Fig. 14.11 to validate its inputs. On any input, if the value entered is other than 1 or 2, keep looping until the user enters a correct value. 14.19 What does the following program print? 1 2 3 Mystery Script 4 5 6 var count = 1; 7 8 while ( count = 1 ) { 9 column = 1; 10 11 while ( column
442 JavaScript/JScript: Control Structures I Chapter 14 to do otherwise by the placement of braces ({}). Because, on first glance, the programmer may not be sure which if an else matches, this is referred to as the “dangling-else” problem. We have eliminated the indentation from the following code to make the problem more challenging. (Hint: Apply indentation conventions you have learned.) a) if ( x < 10 ) if ( y > 10 ) document.writeln( "*****" ); else document.writeln( "#####" ); document.writeln( "$$$$$" ); b) if ( x < 10 ) { if ( y > 10 ) document.writeln( "*****" ); } else { document.writeln( "#####" ); document.writeln( "$$$$$" ); } 14.22 (Another Dangling-Else Problem) Modify the following code to produce the output shown. Use proper indentation techniques. You may not make any changes other than inserting braces and changing the indentation of the code. The interpreter ignores indentation in a JavaScript program. We have eliminated the indentation from the following code to make the problem more challenging. [Note: It is possible that no modification is necessary.] if ( y == 8 ) if ( x == 5 ) document.writeln( "@@@@@" ); else document.writeln( "#####" ); document.writeln( "$$$$$" ); document.writeln( "&&&&&" ); a) Assuming x = 5 and y = 8, the following output is produced. @@@@@ $$$$$ &&&&& b) Assuming x = 5 and y = 8, the following output is produced. @@@@@ c) Assuming x = 5 and y = 8, the following output is produced. @@@@@ &&&&& d) Assuming x = 5 and y = 7, the following output is produced. [Note: The last three output statements after the else are all part of a compound statement.] ##### $$$$$ &&&&& e-Business and e-Commerce: How to Program, by Harvey M. Deitel, Paul J. Deitel, and Tem R. Nieto. Published by Prentice Hall. Copyright © 2001 by Pearson Education, Inc. 2008934301
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