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Many programs accept what are called command-line arguments A command-line argument is the information that directly follows the program s name on the command line when it is executed For C# programs, these arguments are then passed to the Main( ) method To receive the arguments, you must use one of these forms of Main( ): static void Main(string[ ] args) static int Main(string[ ] args) The first form returns void; the second can be used to return an integer value, as described in the preceding section For both, the command-line arguments are stored as strings in the string array passed to Main( ) The length of the args array will be equal to the number of command-line arguments, which might be zero For example, the following program displays all of the command-line arguments that it is called with:

// Display all command-line information using System;

8:

7 (a) (b) (c) (d) (e) (f) 8 (a) (b) (c) (d) (e) (f) 9

class CLDemo { static void Main(string[] args) { ConsoleWriteLine("There are " + argsLength + " command-line arguments"); ConsoleWriteLine("They are: "); for(int i=0; i < argsLength; i++) ConsoleWriteLine(args[i]); } }

Brad s rst task was to answer the question What do I want my readers to do as a result of reading this report EXERCISE 25: Write an Objective Before reading Brad s objective, try writing your own If you were Brad, writing a one-page report for an in-person presentation to the executive

If CLDemo is executed like this:

you will see the following output:

The given line has slope 1/5 Given line has slope 4, hence the requested line has slope 1/4 Write y = 2x + 4 hence slope is 2 Write y = ( 1/2)x hence slope is 1/2 Slope = 4/7 Write y = x/2 5/2 hence slope is 1/2 y + x/2 = 2 y+x+3=0 y + 4x = 11 y + x/5 = 17/5 y = 4x y + x/3 = 1/3

To understand the way that command-line arguments can be used, consider the next program It uses a simple substitution cipher to encode or decode messages The message to be encoded or decoded is specified on the command line The cipher is very simple: To encode a word, each letter is incremented by 1 Thus, A becomes B, and so on To decode, each letter is decremented Of course, such a cipher is of no practical value, being trivially easy to break But it does provide an enjoyable pastime for children

// Encode or decode a message using a simple substitution cipher using System; class Cipher { static int Main(string[] args) { // See if arguments are present if(argsLength < 2) { ConsoleWriteLine("Usage: encode/decode word1 [word2wordN]"); return 1; // return failure code } // If args present, first arg must be encode or decode if(args[0] != "encode" & args[0] != "decode") { ConsoleWriteLine("First arg must be encode or decode"); return 1; // return failure code } // Encode or decode message for(int n=1; n < argsLength; n++) { for(int i=0; i < args[n]Length; i++) {

Part I:

if(args[0] == "encode") ConsoleWrite((char) (args[n][i] + 1) ); else ConsoleWrite((char) (args[n][i] - 1) ); } ConsoleWrite(" "); } ConsoleWriteLine(); return 0; } }

(b )

To use the program, specify either the encode or decode command followed by the phrase that you want to encrypt or decrypt Assuming the program is called Cipher, here are two sample runs:

There are two interesting things in this program First, notice how the program checks that a command-line argument is present before it continues executing This is very important and can be generalized When a program relies on there being one or more command-line arguments, it must always confirm that the proper arguments have been supplied Failure to do this can lead to program malfunctions Also, since the first command-line argument must be either encode or decode, the program also checks this before proceeding Second, notice how the program returns a termination code If the required command line is not present, then 1 is returned, indicating abnormal termination Otherwise, 0 is returned when the program ends