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C# 30: A Beginner s Guide
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class BlockDemo { static void Main() { double i, j, d; i = 50; j = 100; // The target of this if is a block if(i != 0) { ConsoleWriteLine("i does not equal zero"); d = j / i; ConsoleWriteLine("j / i is " + d); } } }
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The target of the if is the entire block
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In this case, the target of the if statement is a block of code and not just a single statement If the condition controlling the if is true (as it is in this case), the three statements inside the block will be executed Try setting i to zero and observe the result As you will see later in this book, blocks of code have additional properties and uses However, the main reason for their existence is to create logically inseparable units of code
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Semicolons and Positioning
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In C#, the semicolon signals the end of a statement That is, each individual statement must end with a semicolon As you know, a block is a set of logically connected statements that are surrounded by opening and closing braces A block is not terminated with a semicolon Since a block is a group of statements, it makes sense that a block is not terminated by a semicolon; instead, the end of the block is indicated by the closing brace
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Does the use of a code block introduce any runtime inefficiencies In other words, do the { and } consume any extra time during the execution of my program No Code blocks do not add any overhead whatsoever In fact, because of their ability to simplify the coding of certain algorithms, their use generally increases speed and efficiency
1: C# Fundamentals
C# does not recognize the end of the line as the end of a statement only a semicolon terminates a statement For this reason, it does not matter where on a line you put a statement For example, to C#,
x = y; y = y + 1; ConsoleWriteLine(x + " " + y);
is the same as
x = y; y = y + 1; ConsoleWriteLine(x + " " + y);
Furthermore, the individual elements of a statement can also be put on separate lines For example, the following is perfectly acceptable:
ConsoleWriteLine("This is a long line of output" + x + y + z + "more output");
Breaking long lines in this fashion is often used to make programs more readable It can also help prevent excessively long lines from wrapping
Indentation Practices
You may have noticed in the previous examples that certain statements were indented C# is a free-form language, meaning that it does not matter where you place statements relative to each other on a line However, over the years, a common and accepted indentation style has developed that allows for very readable programs This book follows that style, and it is recommended that you do so as well Using this style, you indent one level after each opening brace, and move back out one level after each closing brace There are certain statements that encourage some additional indenting; these will be covered later
Try This
Improve the Temperature Conversion Program
You can use the for loop, the if statement, and code blocks to create an improved version of the Fahrenheit-to-Celsius converter that you developed in the first Try This example This new version will print a table of conversions, beginning with 0 degrees Fahrenheit and ending with 99 After every 10 degrees, a blank line will be output This is accomplished through the use of a variable called counter that counts the number of lines that have been output Pay special attention to its use
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