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you are able to transfer information to a function by means of arguments between parentheses following the function name. With the printf() function, for instance, the first argument is usually a string literal, and the succeeding arguments (of which there may be none) are a series of variables or expressions whose values are to be displayed. You ve also seen how you can receive information back from a function in two ways. The first way is through one of the function arguments in parentheses. You provide an address of a variable through an argument to a function, and the function places a value in that variable. When you use scanf() to read data from the keyboard, for instance, the input is stored in an address that you supply as an argument. The second way is that you can receive information back from a function as a return value. With the strlen() function, for instance, the length of the string that you supply as the argument appears in the program code in the position where the function call is made. Thus, if str is the string "example", in the expression 2*strlen(str), the value 7, which the function returns, replaces the function call in the expression. The expression will therefore amount to 2*7. Where a function returns a value of a given type, the function call can appear as part of any expression where a variable of the same type could be used. Of necessity you ve written the function main() in all your programs, so you already have the basic knowledge of how a function is constructed. So let s look at what makes up a function in more detail.

Figure 13-1. ADO.NET tab page 6. Add the following using directive for the SQL Server data provider namespace to Form1.cs:

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When you create a function, you need to specify the function header as the first line of the function definition, followed by the executable code for the function enclosed between braces The block of code between braces following the function header is called the function body The function header defines the name of the function, the function parameters (in other words, what types of values are passed to the function when it s called), and the type for the value that the function returns The function body determines what calculations the function performs on the values that are passed to it The general form of a function is essentially the same as you ve been using for main(), and it looks like this: Return_type Function_name( Parameters - separated by commas ) { Statements; } The statements in the function body can be absent, but the braces must be present.

-f The -f option specifies a file to perform an action on When adding comments, changing passphrases, or performing other key management tasks, ssh-keygen normally prompts for a file Instead, this file can be specified on the command line, thus allowing a less interactive interface into key management The earlier example where a key is exported into SECSH format can be done in one line using the -f option stahnke@rack: ~/ssh> ssh-keygen -e -f /home/sthanke/ssh/id_rsa > SECSH_pub -g The -g option instructs ssh-keygen to print the SSHFP resource records in generic format SSHFPs, or SSH FingerPrints, allow the public host key to be stored as a resource record in DNS This enables the ssh client to perform a lookup of the host key and verify it against the public key being provided by the remote server.

If there are no statements in the body of a function, the return type must be void, and the function will have no effect You ll recall that I said that the type void means absence of any type, so here it means that the function doesn t return a value A function that does not return a value must also have the return type specified as void Conversely, for a function that does not have a void return type, every return statement in the function body must return a value of the specified return type Although it may not be immediately apparent, presenting a function with a content-free body is often useful during the testing phase of a complicated program This allows you to run the program with only selected functions actually doing something; you can then add the function bodies, step by step, until the whole thing works.

using System.Data.SqlClient;

The parameters between parentheses are placeholders for the argument values that you must specify when you call a function The term parameter refers to a placeholder in the function definition that specifies the type of value that should be passed to the function when it is called A parameter consists of the type followed by the parameter name that is used within the body of the function to.

refer to that value when the function executes. The term argument refers to the value that you supply corresponding to a parameter when you call a function. I ll explain parameters in more detail in the Function Parameters section later in this chapter.

7. Insert the code in Listing 13-1 to the click event handler for button1. This will provide the first exception.

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