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Encoding Code-128 in Visual C# Test Your Knowledge: Quiz

Test Your Knowledge: Quiz
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Question 15-1. What is the difference between string and String (lower- and uppercase) Question 15-2. Some of the interfaces implemented by the string are IComparable, ICloneable, IConvertible, and IEnumerable. What do these guarantee to you as a client of the String class Question 15-3. What is a string literal
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15: Strings
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Question 15-4. What is the purpose of escape characters Give two examples. Question 15-5. What are verbatim strings Question 15-6. What does it mean that strings are immutable Question 15-7. What are the two ways to concatenate strings Question 15-8. What does Split( ) do Question 15-9. Why would you use the StringBuilder class instead of a string, and how do you create a string with one Question 15-10. What are regular expressions
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Test Your Knowledge: Exercises
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Exercise 15-1. Create the following six strings: String 1: Hello String 2: World String 3 (a verbatim string): Come visit us at http://www.LibertyAssociates.com String 4: a concatenation of strings 1 and 2 String 5: world String 6: a copy of string 3 Once you have the strings created, do the following: 1. Output the length of each string. 2. Output the third character in each string. 3. Output whether the character H appears in each string. 4. Output which strings are the same as string 2. 5. Output which strings are the same as string 2, ignoring case. Exercise 15-2. Take the following famous string:
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To be, or not to be: That is the question: Whether tis nobler in the mind to suffer the slings and arrows of outrageous fortune, or to take arms against a sea of troubles, and by opposing end them
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Reverse the order of the words in the string, and output the reversed string to the console.
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Test Your Knowledge: Exercises |
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Exercise 15-3. Take the following famous string:
We choose to go to the moon. We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard, because that goal will serve to organize and measure the best of our energies and skills, because that challenge is one that we are willing to accept, one we are unwilling to postpone, and one which we intend to win, and the others, too.
Write a program to determine and output to the screen the number of times the word the occurs in the string. Exercise 15-4. Take the following string:
We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.
and use a regular expression to split the string into words. Then create a new string that lists each word, one to a line, each prefaced with a line number.
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15: Strings
16
Throwing and Catching Exceptions
Things go wrong. Programmers always need to plan for the inevitable problems that arise while their program is running: networks go down, disks fail, computers exhaust their memory, and so forth. In C#, you address these problems with exceptions. An exception is an object that contains information about an unusual program occurrence. When an exceptional circumstance arises, an exception is thrown. (You ll also hear that an exception is raised.) You might throw an exception in your own methods (for example, if you realize that an invalid parameter has been provided), or an exception might be thrown in a class provided by the Framework Class Library, or FCL (for example, if you try to write to a read-only file). Many exceptions are thrown by the .NET runtime when the program can no longer continue due to an operating system problem (such as a security violation). Your job as programmer is to try potentially dangerous code that is, to mark out code that might throw an exception. If an exception is thrown, you catch the exception by writing appropriate code in your catch block. Both try and catch are keywords in C#. Catching an exception is sometimes referred to as handling the exception, and the catch block is often called an exception handler. Ideally, you can provide some code in the catch block so that when the exception is caught, the program can fix the problem and continue. Even if your program can t continue, by catching the exception you have an opportunity to print a meaningful error message and terminate gracefully that is, your program ends and tells the user what happened and why, instead of simply crashing. This chapter describes how to write your programs to catch and handle exceptions. This chapter also shows you how to use the properties of the Exception class to provide information to the user about what went wrong, and it shows you how to create and use your own custom exception types.
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