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window and invoke methods, as shown in Figure 18-1, where the simple expressions e and s are used. More views are available through the Debug menu, including the state of executing threads and the memory. In this simple example, you are examining why isPalindrome misbehaves for an input string of even length. As shown in Figure 18-1, the Watch window has been used to monitor the s and e variables intended to define the bounds of the substring that has still to be checked; in this case, the two indexes cross without ever becoming equal, which is the criteria used to successfully stop the recursion. This happens when s has value 2 and e has value 1 in the example. The symptom of the misbehavior of the function is that an exception is thrown; this is frequently where debugging starts. In this example, the exception would have been thrown a few steps forward when e gets value -1, which is an invalid index for accessing a character in a string. If we used str[e] as the watch expression or in the Immediate window, the problem would appear rather evident. Now that we have found the bug, we can fix it by extending the test from s = e to s >= e to ensure that even if the end index becomes smaller than the starting one, we deal the situation appropriately.

/*!40000 ALTER TABLE `tasking` DISABLE KEYS */; LOCK TABLES `expert_mysql`.`tasking` WRITE; INSERT INTO `expert_mysql`.`tasking` VALUES ('333445555','405',23), ('123763153','405',33.5), ('921312388','601',44), ('800122337','300',13), ('820123637','300',9.5), ('830132335','401',8.5), ('333445555','300',11),

Note Version 4 of CLR introduced a new set of tools for .NET. You must pay attention to which version you re

Note In Visual Studio and other Microsoft .NET debugging tools, the debugger expressions follow the C#

using. If you compile an assembly targeting a framework older than version 4, use the tools located in the directory C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Bin. Otherwise, use the tools in C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Bin\NETFX 4.0 Tools.

('921312388','500',13), ('800122337','300',44), ('820123637','401',500.5), ('830132335','400',12), ('333445665','600',300.25), ('123654321','607',444.75), ('123456789','300',1000); UNLOCK TABLES; /*!40000 ALTER TABLE `expert_mysql`.`tasking` ENABLE KEYS */; /*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */; /*!40101 /*!40014 /*!40014 /*!40101 /*!40101 /*!40101 /*!40111 SET SET SET SET SET SET SET SQL_MODE=@OLD_SQL_MODE */; FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */; UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */; CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */; CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */; COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */; SQL_NOTES=@OLD_SQL_NOTES */;

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syntax, and arrays do not require the dot before the square braces. The most noticeable differences between C# and F# expression syntax are that access to arrays uses [] rather than .[] and the equality operator is == rather than =.

Suppose you re exposing a simple F# object type as a COM component, and you invoke a method of this object type from a JScript script. You define the following type in the hwfs.fs file: namespace HelloWorld open System type FSCOMComponent() = member x.HelloWorld() = "Hello world from F#!"

This section contains some hints and helpful direction for the exercises included in s 10, 11, and 12. Some of the exercises are practical exercises whose solutions would be too long to include in an appendix. For those exercises that require programming to solve, I include some hints as to how to write the code for the solution. In other cases, I include additional information that should assist you in completing the exercise.

We ll now focus on relevant aspects of the debugging facilities that the CLR provides to managed applications and via tools such as the Visual Studio debugger. Consider the notion of breakpoint, an essential tool to mark a statement in the program where you want to suspend its execution and inspect the program state. Often a bug appears only under very specific conditions. Trivial bugs such as the one we have discussed are the easiest to track and the first to be fixed in a program. It can be difficult or even impossible to suspend program execution not at the first execution of a statement but only when certain conditions are satisfied. Many programmers introduce an if statement with a dummy statement for the body and set the breakpoint to the statement to suspend the program under the defined condition; this requires a recompilation of the program and a change to the source code, which may lead to further problems, particularly when several points of the program must be kept under control. A more effective strategy is to use conditional breakpoints, a powerful tool offered by the debugger. With a right-click on a breakpoint in the editor window or in the Breakpoints window (accessible through the Debug menu), a number of additional options become available. For each breakpoint it is possible to indicate the following: A condition: An expression indicates a condition that must be satisfied by the program state in order to suspend the program execution. A hit count: The number of times that the breakpoint should be hit before suspending the execution.

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